The reason for the rejection is
echoed with the reject=reason. For example, the following rule causes mail to fax to be
rejected:
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
14.6 Alphabetized syslog Equates | 527
Rfax $#error $@ 5.1.3 $: cannot send mail to fax
This rule would produce a reject= syslog(3) message such as this:
reject=553 5.1.3
... cannot send mail to fax
A complete description of the construction of rejection messages can be found throughout
Chapter 7.
14.6.21 relay=
The host that sent or accepted the message syslog equate
When running as a daemon and listening for incoming connections, sendmail attempts to
look up the true identity of connecting users and hosts. When it can find that information,
it saves it in the $_ sendmail macro (?§21.9.1 on page 801).
When transporting mail to other hosts, sendmail looks up the MX records for those hosts
and connects to the MX records when they are available. If MX records are not available,
sendmail connects to A or AAAA addresses.
For recipient and sender syslog lines, the relay= syslog equate shows the name of the corresponding
receiving or sending host, followed by the A address, or AAAA address, of that
host (if there was one) in square braces:
relay=root@other.site.edu [123.
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