[SA-exim] FAQ about forwarded mail?

[Magnus Holmgren]

On Thursday 17 May 2007 19:25, Eric Sharkey wrote:
> I've searched the sa-exim list archives and I've seen this issue brought
> up a few times, but never with what seemed to me to be a definitive
> clear answer about how to properly set up a system to handle forwarded
> mail.
>
> Forwarded mail is different from non-forwarded mail since rejecting
> such messages is likely to produce collateral damage, and grey listing
> such messages is actually counter-productive.
>
> Is there a simple guide to configuring sa-exim to never bounce or
> greylist forwarded mail?

I think the easiest way is to set SAEximRejCond in sa-exim.conf to something 
like ${if eq{$acl_m0}{canreject}}. Then you use the power of the ACL system 
to determine whether spam can be rejected or must be quarantined.

I have, after require verify = recipient, 

  accept  local_parts = postmaster : abuse
  accept  hosts = +incoming_relays : ${lookup dnsdb{>:mxh=$domain}}

then some anti-spam measures such as dnslists, then

  accept  set acl_m0 = canreject

The difficulty lies in identifying forwarded mail coming from many different 
places without letting in everything from Hotmail and AOL.

-- 
Magnus Holmgren        holmgren at lysator.liu.se
                       (No Cc of list mail needed, thanks)
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