Re: Spamfiltering outgoing mail

Robert LeBlanc wrote:
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> 
> Eugene Pefti wrote:
> 
> > Can somebody please elaborate one more time on how
to set 
> maia to filter
> > outgoing mail. I have "mynetwork"
configured to allow mail 
> to be relayed via
> > the box but I don't see it is being passed to
amavisd for 
> content checking.
> 
> Before Maia can filter outbound mail, it first needs to
be 
> able to tell
> "inbound" from "outbound".  The way
you do this is by telling 
> Maia about
> all of the (inbound) domains you wish to process mail
for.  Go to the
> Admin->Domains page and make sure that you add all
of the domains for
> which you process mail; if there are many domains to
add, you 
> may prefer
> to use the maiadbtool.pl script to do this in bulk. 
Once you've told
> Maia about these domains, any mail addressed to
recipients in those
> domains will be considered "inbound".  Mail
addressed to recipients in
> all other domains will fall through to the "."
account, and will be
> considered "outbound".
> 
> - From there, you can start treating the "."
account as if 
> it were just
> for outbound mail (since all inbound mail should fall
into one of the
> domains that Maia knows about).  Go to the
Admin->System Configuration
> page and set:
> 
>  Should the System Default user (.) only catch mail for 
> local recipients?
> 
> to "No", if you want outbound mail to be
quarantined/cached like other
> ordinary domains.  Essentially, you treat the
"." domain as a special
> domain for outbound mail--you can adjust its filter
settings 
> and manage
> its quarantines/caches like any other domain, though
only the 
> superadmin
> can manage it.

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.

That would be most cool.

Kurt
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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/>

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