Scanning outbound mail?

Gottschalk, David dgottsc at
Fri Feb 10 14:14:52 GMT 2012

We filter all outbound email for this exact reason.

We had a really big problem with compromised accounts sending spam to the Internet. We'd then get blacklisted by a large number of domains, and it effected everyone.

Currently, we rarely get false positives for outbound spam. I consider this a better alternative than getting blacklisted by 20+ sites and RBLs.

David Gottschalk
Emory University
UTS Messaging Team

-----Original Message-----
From: mailscanner-bounces at [mailto:mailscanner-bounces at] On Behalf Of Richard Lynch
Sent: Friday, February 10, 2012 8:41 AM
To: MailScanner discussion
Subject: Re: Scanning outbound mail?

John Wilcock wrote:
> Le 09/02/2012 17:44, Richard Lynch a écrit :
>> So, I'm trying to get a feel for what other sites do.  Do you use
>> MailScanner for outbound mail?  If so how do you handle messages that
>> are rejected?  Do you bounce it or just ignore it or what?
> I have things set up with rulesets, to bounce spam and to notify
> sender of virus/filename/filetype violations for outbound only.
> On my small site this has never posed any problems, though for larger
> sites you'd have to think about the volume implications if an internal
> sender managed to get infected with a spambot.
> John.
And this is the exact problem that has brought this question up.  We've had some users get infected and spew spam/phishing/etc out in mass through our outbound smtp gateway.  This caused the gateway to get blacklisted which impacted everyone.  So the question has come up about filtering outbound mail.  I don't know if it's a good idea or not.  I don't want to create a bunch of problems not thought of -- the cure being worse than the ailment!  What do your rulesets look like?



Obstacles are those frightening things we see when we take our eyes off our goal.

Henry Ford

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