Re: Spamfiltering outgoing mail

Robert LeBlanc wrote:
> Kurt Buff wrote:
> 
> > So, just to be stupidly clear:
> > 
> > My MM setup is an inbound-only gateway for our 
> single-domain Exchange box - the Exchange box currently

> delivers mail directly to outside recipients. If I set

> > 
> > "Should the System Default user (.) only
catch mail for 
> local recipients?"
> > 
> > to "Yes", and point my Exchange box at
MM as a smarthost, 
> MM will not filter/quarantine/discard mail from my
Exchange 
> box, it just adds a hop to it going outbound to the
world.
> > 
> > If I'm correct in my description (and correct in
my setup 
> otherwise), this would negate the need for me to fiddle
with 
> two instances of postfix on my box, and all the
folderol that 
> goes with it.
> 
> Essentially, yes.  Filtering policies (and associated
quarantining
> actions) are bound to recipient addresses and domains,
so if the
> recipient address of an email matches an address or
domain that Maia
> knows about, it will be subjected to the appropriate
filters. 
>  Mail that
> does /not/ match any known user addresses or domains
falls through to
> the System Default (.) account, and is
subjected to /that/ account's
> policies.
> 
> If you don't want that mail to be filtered or
quarantined, 
> you just need
> to configure the "." account to pass
everything through (i.e. disable
> filtering of all mail types).
> 
> In other words, Maia will only filter mail for users
and 
> domains that it
> knows about; everything else (typically outbound mail)
falls 
> through to
> the catch-all "." domain, which you
can configure any way you like.
> Many sites don't bother filtering outbound mail, so
they 
> leave the "."
> account configured to pass everything through.  That
said, it can be
> useful to filter outbound mail at the very least for
viruses, 
> in case a
> machine on your network becomes infected and tries to
spew 
> malware outbound.
> 
> - --
> Robert LeBlanc <rjlrenaissoft.com>
> Renaissoft, Inc.
> Maia Mailguard <http://www.maiamail
guard.com/>

Thanks! I will be testing this, and subjecting outbound mail
to virus testing, per your suggestion.

Very nice indeed.

Kurt
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