[Mimedefang] Custom variables in filter, undef needed in filter_end?
David F. Skoll
dfs at roaringpenguin.com
Wed Apr 12 13:25:03 EDT 2006
Brandon Hutchinson wrote:
> We are running MD 2.56 with the MD multiplexor and embedded Perl.
> In our configuration, we modify some custom variables in the filter
> subroutine, and use these values in filter_end for attachment reporting, for
> If we do not undef these variables after using them in filter_end,
> subsequent MD slaves appear to add to them. For example, our array
> containing a list of attachments will grow.
Right. A given slave process generally handles more than one message,
and any variables you set will remain set for the life of the process.
> Is it recommended to undef these variables in filter_end? Is this documented
It's probably easier to do all your variable initialization in
filter_begin. It's also safer, because you're guaranteed that the variable
initialization code will have executed before any calls to filter. If you
do it in filter_end, then the initialization code won't have been called
for the very first message to be processed.
> Will $Sender or any of the elements in @Recipients ever have angle brackets?
Yes. In fact, always.
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