SMTP site access protection


SMTP site access protection is available on several levels. To start, you can grant or deny access to specific computers or networks. For computers allowed access, you can require that SSL used for all transmissions sent to the server. Finally, you can grant or deny access to specific user accounts. Not all these options have to be enabled. You can choose how secure you want the SMTP site to be and use the security options to obtain the level of protection needed.

About Security Settings

There are three property sheets available for setting security options. With the Operators property sheet, you can designate permissions for specific user accounts. The Delivery property sheet, Outbound Security button, allows you to enable TLS encryption. The Directory Security property sheet provides settings for SSL. It also includes IP access restrictions in Internet Service Manager, but not Internet Service Manager (HTML). Settings on these property sheets apply to all domains on the site.

Setting Operator Permissions

You can designate which user accounts can have operator permissions for the SMTP site. Once Windows NT accounts are set up, you can easily grant permissions by selecting the accounts from a list. These permits can be rescinded just as quickly by removing the account from the list of site operators.

Requiring SSL for Incoming Connections

You can require that all clients use SSL to connect to the server managed through the default SMTP site. This option secures the connection but not used for authentication.

To use SSL for the server, you must create key pairs and configure key certificates. Clients can then use SSL to submit encrypted messages to Microsoft SMTP Service, which Microsoft SMTP Service can then decode. Microsoft SMTP Service can also use SSL to encrypt messages sent to remote servers.

To use TLS for all outgoing connections, on the Delivery tab, click the Outbound Security button. In the Outbound Security dialog box, select the TLS Encryption options.

If you don’t want to use TLS but a server you commonly connect to requires the use of TLS for all incoming transmissions, clear the TLS encryption check box. You can then create a remote domain for the remote site and select the TSL encryption check box under the Outbound Security on that specific Domain Properties property sheet.

You can use transaction logging to track individual message operations, including time of receipt, delivery to a local mailbox, and recipient access. From the SMTP Site property sheet, you can choose which logging format to uses for recording information about SMTP Service. From the Format list, select a logging format. The default format is the Microsoft US Log Format.

  • Microsoft Logging – A fixed ASCII format.
  • W3C Extended Logging – An ASCII format that can be customized. You choose the items you want to track.
  • NCSA Logging – A fixed ASCII format standard to the National Center for Supercomputing Applications (NCSA).
  • ODBC Logging – Enables you to log to an ODBC database
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Demonstrate SMTP as implemented in IIS


In Outlook Express

  1. Double-click Outlook Express.
  2. Click OK to accept the Outlook Express folder.
  3. The complete path should be
    C:WINNTProfilesAdministratorApplication DataMicrosoftOutlook Express.
  4. In Outlook Express, click Inbox.
  5. The Internet Connection Wizard appears.
  6. In Display name, type Instructor and click Next.
  7. In E-mail Address, type Instructor@cpwebhosting.com or Instructor@dns.microsoft.com and click Next.
  8. In Incoming Mail Server, enter your server name, for example, instructor.classroom.com or server@dns.microsoft.com.
  9. In Outgoing Mail Server, enter instructor.classroom.com or server@dns.microsoft.com and click Next.
  10. In Internet Mail Logon, enter Administrator and leave a blank password, or enter your login credentials.
  11. In Friendly Name, enter an Internet Mail account, for examplelnstructor@classroom.com or Instructor@dns.microsoft.comand click Next.
  12. Click Next to accept the choice to Connect using my LAN.
  13. Click Finish.

In the MMC, on the Default SMTP Site

  1. Right-click the Default SMTP Site and click the Properties tab.
  2. From the Directory Security tab, click Edit in the Relay Restrictions area.
  3. In the Relay Restrictions dialog box, click Allowed to relay, then click OK.
  4. Click OK to close the Default SMTP Site Properties dialog box.

In Outlook Express

  1. Switch back to Outlook Express and click Compose Message.
  2. Send a message to user@somewhere.com, with a subject of not on my site with a short message.
  3. Click Send.

In Windows NT Explorer

  1. Open the Windows NT Explorer and browse to C:InetpubMailrootQueue.
  2. Double-click the file or files with the envelope icon next to it or them.
  3. The message you just sent will be opened.
  4. Close the message.
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Set all delivery and routing options


Use this property sheet to set all delivery and routing options. Settings are grouped into three categories: routing options, transmission options, and security options.

Transmissions Options, Local or Remote Queue

  • Maximum Retries – Use this dialog box to determine how many times to re-send a message before the message is considered undeliverable. After the limit is reached, the message is returned to the sender with an NDR.
  • Retry Interval – Use this dialog box to determine at what interval to re-send a message before the message is considered undeliverable.

Routing Options

  • Maximum Hop Count – Use this dialog box to determine the maximum number of servers a message is routed through before being considered undeliverable.
  • Fully Qualified Domain Name – Use this dialog box to clarify the address for use in message exchanger (MX).
  • Smart Host – Use this dialog box to designate a server through which to route all outgoing messages.

Security Options

  • Masquerade Domain – Use this box to replace any local domain used in any From lines in the header, or Mail From lines in the protocol with a different domain name.
  • Perform reverse DNS lookup on Incoming Messages – Select this check box to verify that the message originated from the computer and domain listed in the From field.
  • Outbound Security – Click Outbound Security to choose the security method for outbound messages.
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Directory Security property sheet


Use the Directory Security property sheet to specify the methods for anonymous access and authentication control, and to set the secure communication method. Also use this sheet to set IP address and domain name restrictions, and to grant or deny permissions to relay mail through the SMTP site.

Anonymous Access and Authentication Control

Allows you to enable anonymous access and edit the authentication methods for this resource. Click Edit to select one of more authentication methods from the following options:

  • Allow Anonymous Access – This option requires no user name or password for access to the resource.
  • Basic Authentication – This option allows client authentication with password sent over the network in clear text using standard commands.
  • Windows NT Challenge/Response – This option allows the client and server to negotiate the Windows NT Systems Security Provider Interface using Windows NT Challenge/Response.

Secure Communications

Sets the Secure Communication method used when the SMTP site is accessed. Once a valid key certificate from a Certificate Authority is installed on your virtual server, you can require that access to your virtual directory take place on a secure channel.

IP Address and Domain Name Restrictions

Use these properties to block individuals or groups from gaining aeecss lo your server, or to grant acc’ess only to specific individuals or groups. Click Edit to set the defaults for your service.

By default, all computers will be:

  • Granted access – Select this option to grant access to all computers by default. Click Add to list those computers that will be denied access by exception.
  • Denied access – Select this option to deny access to all computers by default. Click Add to list those computers that will be granted access by exception.

Relay Restrictions

Use these properties to determine whether to grant or deny permission to relay mail through the SMTP site. Click Edit to set the defaults for your service.

By default, all computers are:

  • Allowed to relay – Select this option to allow all computers to relay mail by default. Click Add to list those computers that, by exception, will not be allowed to relay mail.
  • Not allowed to relay – Select this option not to allow all computers to relay mail by default. Click Add to list those computers that, by exception, will be allowed to relay mail.
  • Allow any computer that successfully authenticates to relay. Select this option to override the default for any computer that authenticates itself successfully.

In order to limit the proliferation of Unsolicited Commercial E-mail (UCE)—special offers, commentaries, or any message a sender wants to convey to as many recipients as possible—the SMTP Service, by default, doesn’t allow mail to be relayed through it to an external e-mail address. To allow mail to be relayed from specific IP addresses, you must change the settings in the Relay Restrictions section of the Directory Security property sheet. Please note that changing these settings will make your site a prime target for UCE.

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SMTP Site Operators


This property sheet designates which user accounts have operator permissions for the SMTP Site. After Microsoft Windows NT accounts are set up, you can grant permissions by selecting the accounts from a list. Removing the account from the list of site operators will rescind these permissions.

Use this property sheet to set limits for messages, including size and number of recipients. If a message exceeds the limits you designate, it is undeliverable and will be returned to the sender along with a Non-Delivery Report (NDR). If the NDR is also undeliverable, the message is sent to the Badmail directory, since the message cannot send or returned. You can use this property sheet to designate the location for the Badmail directory in addition to storage for NDRs and bad mail.

  • Limit Messages – Select this check box to specify limitations to message or session size. The following are two related message size limits.
  • Maximum Message Size – Use this dialog box to indicate a limit to message size—a preferred limit to the server.
  • If a mail client sends a message that exceeds the limit, the message is still processed as long as it does not exceed the Maximum Session Size.
  • Maximum Session Size – Use this dialog box to indicate a limit to session size, which is an absolute limit. A connection is automatically closed if a message reaches this limit.
  • Maximum Number of Outbound Messages per Connection – This option enables you to limit the number of messages sent in a single connection.
  • Maximum Number of Recipients per Message – Use this dialog box to specify the maximum number of recipients allowed per message. The default setting is 100. To impose no limit, clear the dialog box. and then click OK.
  • Send a Copy of Non-delivery Report to – Use this dialog box to specify who should receive a copy of all Non-delivery reports generated by Microsoft. SMTP Service.
  • Badmail Directory – Use this dialog box to set the Badmail directory. Click Browse to search your directory tree for a directory to use for this purpose.
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SMTP Site property sheet


Use the SMTP Site property sheet to set necessary connection parameters. These parameters include identifying what port to use, designating the number of connections that can be opened simultaneously, determining the length of time before a connection closed due to inactivity, and enabling or disabling logging for the SMTP site.

SMTP Site Identification

  • Description : This dialog box allows you to choose the name for the SMTP site that will appear in the tree view for the SMTP service.
  • IP Address : This dialog box lists the IP address for the SMTP site.

Incoming and Outgoing Connections

  • TCP/IP Port : Use this dialog box to designate which port to use for incoming or outgoing TCP/IP connections. The default setting for each is port 25.
  • Limit Connections : Select this check box to specify the number of concurrent connections allowed. The default setting for incoming and outgoing message delivery is 1,000.
  • Connection Timeout : Use this dialog box to specify the time allowed before an inactive connection is closed. The default is 600 seconds.
  • Limit Connections per Domain : Select this check box to limit outgoing connections per domain. The default setting restricts the service to 100 connections.

Logging

  • Enable Logging : Select this check box to enable or disable logging for the SMTP site.
  • Active Log File Format : Use this pull-down menu to choose between Microsoft IIS Log File Format, NCSA Common Log File Format, W3C Extended Log File Format, and ODBC Logging.
  • Properties : Click this button to bring up the Microsoft Logging Properties screen appropriate to the log format selected.
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Installing SMTP Service


Microsoft SMTP Service installed along with the IIS. System requirements for Microsoft SMTP Service are identical to those for IIS.
Starting, Pausing, and Stopping SMTP Service

You can stop and start SMTP Service manually. However, while it is an operation, you must be careful when stopping, pausing, and restarting the service, so users are not affected.

All IIS computers on an organization’s network can be stopped, paused, and restarted remotely from any computer on which Internet Service Manager (ISM) installed.

To administer a service remotely, the user running ISM must be defined in the Windows NT Server Administrators group on the computer to administered.

Changing the Default Startup Setting

You can modify the default startup setting using the Services application in Control Panel.

To modify the default startup setting

  1. Open Control Panel and select Services.
  2. Under Service, select Microsoft SMTP Service, and then click Startup
  3. Under Startup, choose Automatic. Manual, or Disabled.

Manually Starting SMTP Service

If you have set the default startup setting to Manual, you can use ISM to start Microsoft SMTP Service.
To start the SMTP service manually

  1. In the ISM window, expand the SMTP tree structure.
  2. Select the default SMTP server.
  3. From the Action menu, choose Start.

Manually Pausing Microsoft SMTP Service

You can pause Microsoft SMTP Service for updates and maintenance. Pausing prevents new client connections, but enables Microsoft SMTP Service to continue processing existing client connections and deliver queued mail. Messages with the .eml extension cannot be deleted from the Queue directory while the service paused.

To pause SMTP service manually

  1. In the ISM window, expand the SMTP tree structure.
  2. Select the default SMTP server.
  3. From the Action menu, choose Pause.

Manually Stopping SMTP Service

You can stop Microsoft SMTP Service for updates and maintenance.

To stop SMTP service manually

  1. In the ISM window, expand the SMTP tree structure.
  2. Select the default SMTP server.
  3. From the Action menu, choose Stop..
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Server platform for Microsoft SMTP Service


IIS provides the server platform for Microsoft SMTP Service. Like other 115 services, such as FTP and WWW, SMTP Service administered through the Internet Service Manager (ISM). It has a similar look and feel like the other IIS services and managed in the same manner. SMTP Service administered through SMTP Service Manager (HTML).

ISM Display Settings

All IIS services set for the computer displayed in the ISM. A node in the pane of the ISM represents Microsoft SMTP Service. When you select one of the nodes, detailed information about it displayed in the right pane. The following list describes the computer and SMTP Service nodes, as well as the function of the component represented:

  • Computer node – This node displays information about Microsoft SMTP Service, including operational status, the IP address, and the port.
  • SMTP Site node – This node is the main administrative component of Microsoft SMTP Service. It provides access to the property sheets for configuring the virtual server. When you double-click the node, a list of domains and current sessions is displayed.
  • Domains node – This node provides access to the Domain Properties property sheet for creating and configuring domains and displays information about all domains set up on the virtual server. Domains are organizational components of Microsoft SMTP Service.
  • Current Sessions node – This node lists the user, source location, and connection time for each currently connected session.

Default Domain

The SMTP site in the ISM is a virtual server you use to run Microsoft SMTP Service and IIS. It includes a default domain, which is used to stamp messages from addresses that do not have a domain. There is a single default domain, and it cannot be deleted. You can, however, create an alias domain. All alias domains use the default domain to stamp messages.

Mailroot Directory and Default Directories

Setup installs five default directories in the Mailroot directory for Microsoft SMTP Service. The SortTemp directory, not listed below, stores temporary files. The Mailroot directory must be installed on the same drive as Microsoft SMTP Service. The default location is C:InetpubMailroot, but you can designate a different location during setup. If you install the Mailroot directory on an NTFS file system partition, you can move the Badmail and Drop directories to a different partition. The other directories must stay in the Mailroot directory on the NTFS partition.

The following list describes the Mailroot directories and their contents:

  • Badmail – Stores undeliverable messages that cannot be returned to the sender.
  • Drop – Receives all incoming messages. You can change the location provided you do not select a directory already designated as the Pickup directory . You can designate a different Drop directory for each domain.
  • Pickup – Picks up outgoing messages that are manually created as a text file and copied to the directory. As soon as a message is placed in the Pickup directory, Microsoft SMTP Service picks it up and initiates delivery.
  • Queue – Holds messages for delivery. If a message cannot be delivered because the connection is busy or down, the message is stored in the queue and sent again at designated retry intervals.

A common component of Internet sites is mail delivery. Internet messages are generally transmitted and delivered through the use of the Simple Mail Transfer Protocol (SMTP) protocol. Dedicated to the SMTP delivery process, Microsoft SMTP Service allows you to configure your hardware for sending and receiving messages over the Internet. It also provides additional features that enable you to customize your configuration to accommodate unique delivery and security requirements.

Simple Mail Transfer Protocol (SMTP) is the protocol for sending e-mail messages between servers. The SMTP Server in IIS 4.0 provides an implementation of SMTP, but is not a full SMTP server.

Standard Internet Protocol Support

Microsoft SMTP Service provides full support for Simple Mail Transfer Protocol and is compatible with standard SMTP mail clients.

Administration Using the Internet Service Manager

SMTP Service uses Internet Service Manager (ISM) and SMTP Service Manager (HTML) for administration, included with Microsoft Internet Information Server version 4.0 (IIS). In addition, SMTP Service uses other Microsoft Windows NT Server administrative features including performance monitoring and event logs. These tools allow administrators to collect usage statistics and examine usage patterns, monitor server performance, and identify potential problems.

Advanced Security

SMTP Service supports use of the Transport Layer Security Protocol (TLS) for encrypting transmissions.

Directed Mail Drop and Pickup

For each configured domain, SMTP Service supports the placement of all incoming messages directly into a Drop directory. This allows SMTP Service to be used as a mail receiver for other applications.

In addition to connecting to a TCP port to send messages, applications can also use a Pickup directory. Once a message is placed in the Pickup directory, SMTP Service delivers the message, thus simplifying the development of external mail services.

Posting Acceptor allows IIS, Microsoft Peer Web Services, and Microsoft Personal Web Server to accept Web content from Microsoft Web Publishing Wizard/API, Microsoft Internet Explorer, and Netscape Navigator 2.02 or later through any standard HTTP connection. In conjunction with Microsoft Content Replication System (CRS), Posting Acceptor can also distribute content to multiple servers simultaneously.

Note For additional information on setting up and configuring Microsoft Posting Acceptor, please refer to the Windows NT 4.0 Option Pack product documentation.

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Property Sheets


The FTP Service uses five different property sheets to configure specific areas of the service. During the installation of IIS, default values are assigned to the various properties on the property sheets. These properties can be set on the site level, directory level, and even on the file level.

Master

When IIS is installed on your computer, certain default properties are applied to the Master property sheets. Every virtual FTP site you create inherits these settings. If you change the settings on the Master property sheets, subsequent virtual FTP sites will inherit the new settings, but previously created virtual FTP sites will not.

Note To access the Master property sheets, open the Internet Service Manager, right-click on your computer icon, click Properties, and then click the Edit button under the heading Master Properties.

Default

The installation process created a Default FTP Site with its own default properties. Every file you create within the Default FTP Site will inherit these settings.

Files

Files created in a virtual FTP directory will inherit the virtual FTP directory’s property sheet settings, whereas files created in the Default FTP Site will inherit the settings of the Default FTP site’s property sheets. After a file is created, property sheets can be configured on the file level.

All FTP property sheets can be accessed using the Internet Service Manager snap-in for Microsoft Management Console.

To access the FTP property sheets

  1. From the Start menu, point to Programs, Microsoft Internet Information Server, and then click Internet Service Manager.
  2. In the left pane, double-click the IIS node.
  3. In the left pane, double-click the computername node.
  4. Right-click Default FTP Site, and then click Properties.

The FTP Property Sheet dialog box appears with tabs for each property sheet.
Use this property sheet to change the home directory for your FTP site or to modify its properties. The home directory is the central location for the published files in your FTP site. A default home directory, called Ftproot, is created when you install the FTP service. You can change the location of the home directory to one of the following:

  • A directory located on this computer
  • A share located on another computer

Access Check Boxes

These check boxes determine the type of access allowed to the director}’.

  • Read. Check this box to enable Web clients to read or download files stored in a home directory or a virtual directory.
  • Write. CheckThis box to enable Web clients to upload files to the enabled directory on your server or to change content in a Write-enabled file. Write can only be done with a browser that supports the PUT feature of the HTTP 1.1 protocol standard.
  • Log Access. Check this box to record visits to this directory in a log file.

Directory Listing Style

Select either UNIX or Microsoft MS-DOS to indicate which directory listing style is sent to FTP users.
Use this property sheet to set the KIP site identification, specify the number of connections allowed, and enable logging for the FTP site.
Identification

  • Description – This dialog box lists the name you choose for the Web site and will appear in the tree view of the Internet Service.
  • IP Address – This dialog box lists the IP address for the FTP site.
  • TCP Port – This dialog box determines the port on which each service will run.

Connections

  • Unlimited – Select this option to allow an unlimited number of connections to occur simultaneously.
  • Limited to – Select this option to limit the number of simultaneous connections to the server. In the dialog box, type the number of connections permitted.
  • Connection Timeout – Sets the length of time in seconds before the server disconnects an inactive user.

Enable Logging

Select this option to enable your Web site’s logging features, which can record details about user activity and create logs in’ your choice of format.

The Properties button brings up the Microsoft Logging Properties screen appropriate to the Active log format you have chosen. For example, clicking Properties for W3C Extended Log File Format would allow you to choose how often to create new logs, specify the file directory for the log, and select additional extended properties for logging.

Current Sessions

Click the Current Sessions button to view a list of users currently connected to the FTP Service.
Use the Security Accounts property sheet to control which users can access your server and to specify which account to use for anonymous client logon requests.

Anonymous Connections

Select the Allow Anonymous Connections check box to allow users using the username “anonymous” to log on to your FTP server. Use the User Name and Password dialog boxes to establish the Microsoft Windows NT user account to use for permissions for all anonymous connections. By default, IIS creates and uses the account IUSR_computername for all anonymous logons.

  • Allow Only Anonymous Connections. Select this box to prevent users from logging on with user names and passwords.
  • Enable Automatic Password Synchronization. Select this option to enable your Web server to automatically synchronize your anonymous password settings with those set in Windows NT,

Note If you select Allow only anonymous connections, the user password will be sent as plain text. You will need to inform your users to type their e-mail address as their password when accessing an FTP site.

FTP Site Operators

Use the FTP Site Operators dialog box to designate the Windows NT User Accounts you want to be able to administer this FTP server. To add a Windows NT User Account to the current list of accounts that have administrative privileges, click the Add button. To remove a Windows NT User Account from this list, select the account in the Operators list box, and then click the Remove button.

Messages

Use this property sheet to create the messages that will be displayed to browsers that contact your site. All the message fields are blank by default.

  • Welcome – This dialog box holds the message that will be displayed to clients when they first connect to the FTP server.
  • Exit – This dialog box holds the message that will be displayed to clients when they log off the FTP server.
  • Maximum Connections – This dialog box holds the message that will be displayed to clients who try to connect when the FTP service already has the maximum number of connections allowed.

Use the Directory Security property sheet to set access privileges by specific IP address. This allows you to block individuals or groups from gaining access to your server or to grant access only to specific individuals or groups.

TCP/IP Access Restrictions

By default, all computers will be:

  • Granted Access – Select this button to grant access to all computers by default. Click Add to list those computers that will be denied access.
  • Denied Access – Select this button to deny access to all computers by default. Click Add to list those computers that will be granted access.

Microsoft Posting Acceptor is a server add-on tool that Web content providers can use to publish their content using HTTP Post (RFC 1867). After installing Posting Acceptor on your Web server running Microsoft Windows NT Server, Microsoft Windows NT Workstation, or Microsoft Windows 95, you will be able to provide a hosting service for users who want to post Web content to your server.

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Microsoft SMTP Service


Microsoft SMTP Service uses the SMTP protocol to transport and deliver messages. Messages transferred between remote mail servers and the Drop directory designated for the default domain. Client and server connections to SMTP do not involve user interactions and tend to be fairly short. Microsoft SMTP Service is designed to provide quick turnaround on connections to maximize messages-per-second processing.

How Microsoft SMTP Service Works?
When a message is placed in the Pickup directory or comes in through the designated TCP port, it is placed in the Queue directory. If the recipients are local, the message is delivered. If they are non-local, the message is processed for remote delivery.

Local Message Delivery

If a message is determined to be for a local recipient, the message is moved from the Queue directory to the Drop directory designated for the default domain. Once deposited in the Drop directory, the Microsoft SMTP Service delivery cycle is complete. The Drop directory can be designated on the Domain Properties property sheet.

Remote Message Delivery

The following list describes the processes that Microsoft SMTP Service uses to deliver remote messages:

  • Sort messages and queue for delivery : Messages remain in the Queue directory. They are sorted by domain so Microsoft SMTP Service can send them as a group. This enables Microsoft SMTP Service to optimize connections by delivering multiple messages in one session.
  • Determine if the receiving server is ready to receive messages. Microsoft SMTP Service attempts to connect to the receiving mail server. If the server is not ready, the message is returned to the queue, and delivery is attempted again at designated intervals to a maximum number of attempts. The settings for maximum retries and retry interval can be set on the Delivery property sheet.
  • Verify recipients : Each message recipient is verified. If a recipient is not verified, a non-delivery report (NDR) is generated for that recipient. You can designate where to store undeliverable messages and NDRs on the Messages property sheet.
  • Send the message : The message is sent. Once the receiving server acknowledges the transmission, Microsoft SMTP Service delivery is complete. Delivery options are described below:
  • If you have enabled Transport Layer Security (TLS) encryption for remote delivery, Microsoft SMTP Service encrypts all outgoing messages. You can also enable or disable this function for a specific remote domain. TLS encryption can be set on the Delivery property sheet by clicking the Outbound Security button and clearing or selecting TLS encryption.
  • All messages can be sent to a smart host, which then sends them to recipients. The smart host can be designated on the Delivery property sheet.
  • Messages destined for a remote domain can also be delivered using a specific route. This option enables you to specify a route that may be quicker and less costly than a direct link. This option overrides the smart host setting. Route domains can be set on the Domain Properties property sheet for the remote domain.
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