Symbols without callbacks may no longer break ACL rules.
Symbols without callbacks may no longer break ACL rules.

Mopher has a few symbols without callback functions to resolve them. Most of
them are set by milter.c (e.g. message_id, queue_id, subject, etc.). If these
symbols were used in ACL rules but the message did not contain the appropriate
headers, an error was returned and ACL evaluation stopped. These symbols are
now set to NULL.

badzong/mopher,badzong/mopher