securing relay...

[Scott Silva]

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Glenn Steen spake the following on 10/6/2005 7:12 AM:
> On 05/10/05, JD Doelitzsch <jd at baritec.com> wrote:
> 
>>Thanks again guys, I checked the relay using those site and it seems to be
>>secure. I think what might be happening is my MS box takes any email then
>>forwards it to my winbox which will accept or deny depending on if there is
>>such a user. If no user my MS box tries to return to sender and so it looks
>>like spam is going out. Is this a possible scenario? would this generate
>>enough returned email that is spam to blacklist me? I am considering using
>>milter-ahead as a possible fix. What do you think?
>>
>>-JD
> 
> Yes, well ... if you check the archives to this list you'll find a lot
> about this ("NDR-spam", "backwash", whatever). You could be
> "originating" a hefty amount of spam, yes. But, to my knowledge, no
> BLs blacklist this type of behaviour as such ... yet (but then, you
> might be the first ... :-)..
> At least for postfix, this is documented in the wiki
> (http://wiki.mailscanner.info/doku.php?id=documentation:configuration:mta:postfix:how_to:reject_non_existent_users))
>  ... using milter-ahead seems to be a reasonable way of fixing this
> for sendmail.
> 
> --
> -- Glenn
> email: glenn < dot > steen < at > gmail < dot > com
> work: glenn < dot > steen < at > ap1 < dot > se
> 
And not bouncing mail with the attachments still there.


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