On Mon, 14 Jan 2002, Tzafrir Cohen wrote:

> On Mon, 14 Jan 2002, Denis HAVLIK wrote:
>
> > Folks,
> >
> > Why don't we make a really simple anti-virus program, which simply rejects
> > all .doc, .exe, etc attachements? I for one would love to have such a
> > possibility in postfix configuration.

>
> One thing though: Where exactly is this filtering performed in postfix?

Just a clarification:

Mail can be generally filtered in three places:

1. before recieving
   Offending messages don't even get into the queue. If the filtering is
   really simple it should be done here

2. "Inside the queue"
   Using the filtering interface. This has a disatvantage of an overhead
   (every message is twice in the queue) but it is probably relatively
   easy to implement

3. At delivery
   Using procmail or whatever.
   This is easy to implement if procmail is used (although there are
   problems of user vs. system settings).
   Disatvantages:
      - not scanning outgoing mail
      - If a message is delivered to multiple users, it will be scanned
        multiple times (not a big deal with such a simple filter)

-- 
Tzafrir Cohen                        /"\
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