IMPORTANT: You must restart the smtpd executable to effect most changes in the SMTP Agent's configuration. Any exceptions are noted below. For information on loading and unloading the NetMail® Agents, see the Novell® NetMail Administration Guide at http://www.novell.com/documentation.
Port Assignments |
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The standard port used for unsecure mail transfer is port 25 while the standard port used for mail transfer, over SSL, is port 465. Changing the ports used by the SMTP Agent requires that the mail transfer agents, or SMTP servers, delivering mail to this system be configured to reflect the ports assigned here. IMPORTANT: You must restart the smtpd executable to effect any changes in this property.
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Flags |
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A series of standard SMTP commands that you can enable on the current SMTP Agent. Select the commands you want the SMTP Agent to accept. IMPORTANT: You do not need to restart the smtpd executable to effect changes to this property. Instead, changes are implemented within 5 minutes.
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Allow VRFY Command |
The VRFY command allows external clients to verify that a user exists in your messaging system. If enabled, VRFY can pose a security risk because it allows external users to anonymously request verification of usernames. For example, if spammers want to find out the usernames in your company, they could query the system with a series of usernames until the system verified a valid username. When verifying that a user exists in the messaging system, the SMTP Agent references the context list maintained by the messaging server. If the user is not listed in the context list, the SMTP Agent returns a User Not Found message. For more information on NMAP Agent contexts, see the NMAP Agent's Context property.
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Allow EXPN Command |
The EXPN command expands a group name upon request and lists all the user names in that group. This command is also considered a security risk because it allows spammers to anonymously request group membership lists. For example, if a spammer makes a request to expand a system-wide group such as Everyone, the SMTP Agent returns the complete membership list, which is, essentially, every username in your organization.
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Verify Addresses on Recipient |
By default, the SMTP Agent accepts all incoming messages and places them in a queue where their addresses are verified, as resources are available. This process facilitates rapid message processing. However, if you want the SMTP Agent to perform address verification before accepting messages into your NetMail system, select Verify Addresses on Receipt. IMPORTANT: NetMail aliasing does not work if Verify Addresses on Recipient is selected. When this option is enabled, the SMTP Agent intercepts messages before they are processed in the message queue; consequently, messages addressed to NetMail aliases are deleted before the Alias Agent can process them.
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Send ETRN |
The SEND ETRN command requests a remote server to send any messages it has queued for your messaging system. This option is primarily for organizations with dial-up Internet connections. For more information, see the Novell NetMail Administration Guide at http://www.novell.com/documentation.
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Accept ETRN |
The ACCEPT ETRN command allows a remote server to request queued messages. If enabled, the SMTP Agent responds to this request by sending any messages it has queued for that system. ACCEPT ETRN is the only SMTP flag that is selected by default. For more information, see the Novell NetMail Administration Guide at http://www.novell.com/documentation.
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Forward Delivery Options |
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A forwarding host is a relay point for remote messages. It is often used to transfer outbound messages through a firewall. ETRN Domains also use forwarding hosts to relay transfer messages to their relay service. Forwarding messages created locally will relay local and remote recipients to the forwarding host for delivery. Messages received by the SMTP Agent for local recipients are not affected by this setting. IMPORTANT: You must restart the smtpd executable to effect any changes in this property.
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Forwarder Address |
To funnel all remote messages through another SMTP Agent rather than having the current SMTP Agent access the Internet, enter the host name or IP address of the SMTP server that you plan to use as the mail relay host. All remote messages going through this SMTP Agent are then forwarded to the SMTP Agent at the designated address. |
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Forward Messages Created Locally |
To funnel all created messages, for local and remote recipients, through another SMTP Agent rather than having the current SMTP Agent handle delivery, enable Forward Messages Created Locally.
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