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SMTP Agent - UBE Relaying

This page provides options that prevent spammers from using your messaging system to relay unsolicited bulk e-mail (UBE) or SPAM.

IMPORTANT: You do not need to restart the smtpd executable to effect changes to these properties. Instead, changes are implemented within 5 minutes.

 

Flags

Do SMTP-after-POP

Prohibits users from sending remote messages through the SMTP Agent until they have first authenticated with the messaging system via their POP3 or IMAP4 client. This works for most Internet e-mail clients because these clients always check for e-mail (log in) just before sending messages.

This feature also includes the username of the person who authenticated with the messaging system in the message header. This helps track spammers who authenticate with a valid username but fake the message header to mask their identity.

SMTP-after-POP requires that you run the Connection Manager Agent and that you configure the Connection Manager option on the messaging server running the SMTP Agent.

See the Novell® NetMail® Administration Guide for detailed instructions on configuring SMTP-after-POP authentication.

 

Allow Remote Sending for Authenticated Users Only

Enables Extended SMTP (ESMTP) authentication. If selected, the e-mail client must authenticate through the ESMTP protocol before the SMTP Agent relays its messages to remote recipients. Netscape Communicator* and Outlook* Express support ESMTP authentication.

If both SMTP-after-POP and ESMTP authentication are enabled, they function as an either/or option. If a mail client does not authenticate via POP or IMAP when downloading mail, it must authenticate via ESMTP before it can send remote messages.

 

Require Sender to Be in Allowed List

Restricts access to your NetMail system by selectively allowing access. If enabled, only mail hosts with an IP address designated in the Allowed Hosts list can relay remote messages through the current SMTP server.

If SMTP-after-POP, ESMTP authentication, and Require Sender to Be in Allowed List are all enabled, they function as an either/or option. If an e-mail client does not authenticate using of POP or IMAP when downloading mail, it must authenticate using ESMTP or the Allowed Hosts list must include it before it can send remote messages.

 

Maximum Number of Recipients per E-Mail

Restricts the number of users who can receive the same message. This option affects both inbound and outbound Internet messages.

If a message exceeds the threshold, the SMTP Agent begins at the top of the recipient list and sends the message to the number of recipients designated in this field.

You can also configure the ModWeb Mail Module to restrict the number of recipients per message sent by users in the Modular Web client.

 

Relaying

Allowed Hosts

A list of allowed IP address ranges. When the Require Sender to Be in Allowed List option is selected, only hosts that fall within the designated IP address ranges are allowed to send messages to remote recipients via the current SMTP Agent.

If an ISP or corporation has its own Web server, listing the organization’s range of registered IP addresses prevents external hosts, such as spammers, from relaying messages through the company’s messaging system.

In addition to preventing external hosts from relaying messages through your messaging system, you can use the Allowed Hosts list to prevent internal hosts from relaying remote messages. To restrict which workstations outside your organization that you allow to send remote messages, designate ranges of internal IP addresses.

NOTE: If a workstation’s IP address is not in an Allowed Hosts range, you can still use the workstation to send messages to users within the local messaging system.

To add an allowed host, type a range of allowed IP addresses in the Allowed Hosts box and click Save. Enter one allowed host per line.

For example:

251.70.2.53-251.70.2.60

 

Relayed Domains (ETRN)

ETRN Domains are messaging systems that use a hosting service, such as an ISP or ASP, to send and receive messages over the Internet. These systems have their own messaging servers, agents, and mail directories; however, all their messaging services are local. Consequently, they must use a hosting service to send and receive remote messages. In most instances, ETRN Domains have non-persistent dial-up connections to their ISP or ASP.

For more information, see the Novell NetMail Administration Guide at http://www.novell.com/documentation.

To add an ETRN domain, enter the IP address or host name of the ETRN domain’s SMTP server and click Save. Enter one ETRN domain per line.

IMPORTANT: To support these domains, you must click the Accept ETRN option in the Options page.

 

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