sendmail, 4th Edition

$={persistentMacros}

Macros preserved in the qf file V8.10 and later

When a message is first accepted, sendmail usually queues it first,^[336] then tries to deliver it. The qf file contains all the envelope information about a message, including information specific to the sendmail delivery process, and several macros whose values are important to preserve between queue runs. This {persistentMacros} class holds the names of those important macros.

When V8.10 sendmail and later starts to run, it adds to the {persistentMacros} class a list of five macro names:

• The $r macro ($r on page 842) holds the protocol used to receive a message when it was first accepted.

• The $s macro ($s on page 844) holds the hostname of the sender’s machine.

• The $_ macro ($_ on page 801) holds the validated hostname and address, RFC1413-validation (if available), and IP source route information associated with the incoming SMTP connection.

• The ${if_addr} macro (${if_addr} on page 827) holds the IP address of the interface on which the message was received.

• The ${daemon_flags} macro (${daemon_flags} on page 818) holds the flags specified by the DaemonPortOptions option (DaemonPortOptions on page 993).

To add macro names to this class, omit the leading dollar symbol. For example, you might add the macro ${MyMacro} like this:

LOCAL_CONFIG
C{persistentMacros} {MyMacro}

However, you are strongly advised not to add any macros to this class. Should you feel the need to do so, take enough time to fully examine how that macro ...