Scanning outbound mail?

Phil Hale phaleintx at
Fri Feb 10 21:21:35 GMT 2012

We have set up two sets of separate inbound only and outbound only 
servers.  This allows us to have a clean stream both in and out.  The 
inbound rules being much more restrictive and the outbound more 
leanient.  We also use our outbound as our authenticated relay hosts so 
that those not using Exchange (which smart host out) use the same final 
SMTP demark from out Campus.  This allows us to set up clean DKIM/SPF 
rules for mail leaving our Campus for both our Exchange/Outlook users as 
well as those of us who prefer IMAP/Thunderbird.

Phil Hale
Systems Programmer II - Linux Systems Administrator
Information Technology - Systems Department
Texas A&M University-Corpus Christi

On 02/09/2012 10:44 AM, Richard Lynch wrote:
> Hi Everyone,
> We currently don't use MailScanner to scan outbound mail -- we only 
> scan inbound messages.  We do use clamav with some of the sanesecurity 
> DBs on outbound but that's it.  Scanning outbound mail would be 
> problematic because of false positives and differing requirements.  
> For example, I don't want to bounce spam detected messages on inbound 
> but on outbound it would probably be a requirement so that the sender 
> (one of our users) would know that their message wasn't sent.
> 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 appreciate any input or advise anyone wants to offer.
> Richard Lynch

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