HP-UX Mailing Services Administrator's Guide (B2355-91064)

Defining Hosts Allowed to Relay: Class R
You can use the $=R macro to define the hosts that are allowed to relay. The default
file Sendmail uses to read values for the $=R macro is /etc/mail/relay-domains.
Queue Changes
This section describes miscellaneous enhancements to the queue option:
• The queue option allows multiple -qI, -qR, or -qS queue run limiters.
For example, using Sendmail -qRfoo -qRbar will deliver mail to recipients
with foo or bar in their address.
• The map flag -Tx appends x to lookups that return temporary failure. This is
similar to the -ax flag, which appends x to lookups that return success.
• The QueueSortOrder option is case sensitive.
Spam Control Using the Message Submission Agent (RFC 2476)
Sendmail supports RFC 2476, a protocol for message submission. The anti-spam rulesets
have been enhanced to improve the anti-spam capabilities. The RFC proposes a new
standard for the Message Submission Agent (MSA). This is designed to replace the
more general-purpose Mail Transfer Agent (MTA) as the first service to which a Mail
User Agent (MUA) connects to deliver a mail message. The RFC also describes how
the usual protocols for SMTP service must be tightened up at the point where mail
enters the system, rather than being routed from one site to another. Sendmail also
serves as a powerful tool to authenticate and control mail messages.
By default, MSA is defined in the sendmail.cf file as:
O DaemonPortOptions=Name=MSA, Port=587, M=E
where Port 587 is reserved for e-mail message submission.
An MSA still uses the same rulesets for processing the message (and therefore still
allows message rejection via the check rulesets). In accordance with the RFC, the MSA
ensures that all domains in the envelope are fully qualified if the message is relayed
to another MTA. It also enforces the normal address syntax rules and log error messages.
In addition, you can request authentication before the messages are accepted by MSA
by using the M=a modifier in the DaemonPortOptions.
90 Configuring and Administering Sendmail