sendmail, 4th Edition

MASQUERADE_EXCEPTION_FILE mc Macro

If you have many exceptions defined with the MASQUERADE_EXCEPTION mc configuration macro, you can store them in a single file—say, donotmasq—and read that file using the MASQUERADE_EXCEPTION_FILE mc macro:

MASQUERADE_EXCEPTION_FILE(`/etc/mail/donotmasq')    ← V8.12 and later

Essentially, all that MASQUERADE_EXCEPTION_FILE does is read the external file using the F configuration command. As a consequence, you can add an F-style argument to its declaration:

MASQUERADE_EXCEPTION_FILE(`-o /etc/mail/donotmasq')    ← V8.12 and later

Here, we added a -o to make the existence of the file optional.

Note that the file specified with MASQUERADE_EXCEPTION_FILE is read only once, when sendmail first starts.