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SMTP Agent: UBE Relaying

You can keep your NIMS system from relaying UBE (unsolicited bulk email) or spam messages.

Provide the SMTP Agent UBE relaying settings > click Apply to save the settings.

Flags

Do SMTP-after-POP
Prohibits anyone from sending messages through the SMTP Agent until they have first authenticated with the your NIMS system by way of their POP3 or IMAP4 client within a designated time frame. This works for most Internet email clients because they always check for email (log in) just before sending messages. This option requires that you run the Connection Manager to perform the user authentication.

Allow Remote Sending for Authenticated Users Only
Enables SMTP authentication. If selected, the email client must authenticate to the SMTP Agent before the agent will relay its remote messages. Netscape Communicator and Outlook Express support SMTP authentication or an allowed list.

If SMTP-after-POP and SMTP Authentication are both enabled, they function as an either/or option. If an email client does not authenticate by way of POP when downloading mail, it must authenticate by way of SMTP before it can send remote messages.

Require Sender to be in Allowed List
Restricts access to your NIMS system by selectively allowing access. If selected, only mail hosts with an IP address designated in the Allowed Hosts list can relay remote messages through this SMTP Agent. The Allowed Hosts list is defined below.

Maximum Number of Recipients per Email
Restricts the number of users who can receive the same message.

Allowed Hosts
Type a list of allowed IP address ranges, with one address per line. If Require Sender to Be in Allowed List is selected above, only the hosts that fall within the designated IP address ranges can relay remote messages through the current SMTP Agent.

Relayed Domains (ETRN)
Provide a list of domain names. NIMS will relay messages addressed to one of these domains regardless of any UBE settings. This feature is used in conjunction with the ETRN SMTP extension. A mail server that is not permanently connected to the Internet cannot receive mail. An ETRN host will accept mail for one of these dialup systems and hold it until they request it via the SMTP ETRN command. In such a scenario it is neccessary to point the DNS MX record with the lowest preference to the dialup server’s IP address, and another DNS MX record with a higher preference number to the NIMS system that is acting as relay.

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