sendmail, 4th Edition

2017-07-07 02:10:07

${mail_host}

Saved $@ value for MAIL FROM: triple

V8.10 and above

Upon receipt of the MAIL FROM: address, a delivery agent is selected by the RHS of a parse rule set 0 rule, which defines a triple that contains three pieces of information for that address:

$# delivery_agent $@ host $:address

The $@ portion of the triple contains the host to which to connect for delivery. For example:

wash.dc.gov

Once that host is determined for the $@ part of the triple, it is copied to this ${mail_host} macro.

${mail_host} is transient. If it is defined in the configuration file or in the command line, that definition can be ignored by sendmail . Note that a $& prefix is necessary when you reference this macro in rules (that is, use $&{mail_host} , not ${mail_host} ).

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