Indeed it is. Indeed it does.
I use 'procmail-sanitizer', which, since I use procmail
anyway to filter out known spam and do a presort of
various mailing lists, I don't consider an overhead.

Of course if your machine is a gateway or a server
for many domains, this might not apply. But I would
have thought that in that case Postfix would have been
able to have a filter in between the input and output
queues without having to actually go though the whole
process twice. More like the way Smail3 used to do
things .... The sanitizer documentation describes
how to splice it in to sendmail (UGH!)

If you think about it, for a relay, just about any
filter will be possible if you are willing to use the
'two machine' approach.

http://www.impsec.org/email-tools/procmail-security.html

Anton J Aylward

> -----Original Message-----
> From: Tzafrir Cohen [mailto:tzafrirtechnion.ac.il]
> Sent: Monday, January 14, 2002 1:19 PM

> > That tells postfix to send mail to vscan by default.
> >
> > Hope that helps.
>
> Note that this method has some overhead:
>
> * more complicated
>
> * any message is twice in the queue, and thus consumes more server
> resources.

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