Don't crash with -f "". Changed the default from envelope to be MAILER-DAEMON.
Don't crash with -f "". Changed the default from envelope to be
MAILER-DAEMON.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot