Vicious Circle

[Martin Hepworth]

Dave Goodrich wrote:
> Steen, Glenn wrote:
>
>>> -----Original Message-----
>>> From: MailScanner mailing list
>>> [mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf Of Dave Goodrich
>>> Sent: den 5 mars 2005 18:10
>>> To: MAILSCANNER at JISCMAIL.AC.UK
>>> Subject: Vicious Circle
>>>
>>
>> (snip)
>>
>>> I am at a loss, the root of the issue is I have 100k messages a day,
>>> some just *might* be legitimate address misspellings, I can't drop all
>>> bounces. But the vast majority are trash.
>>
>>
>>
>> I think you have a "fault" in your reasoning here. The responsibility
>> (and thus requirement to produce bounces) for a message is not yours
>> until after you've accepted the message. So if you do, as many here have
>> already recommended, reject (with a 550) any unknown recipients/domains,
>> then the resposibility to generate a NDN/NDR would still be _the sending
>> MTAs problem, not yours_.
>
>
> Ahh, I understand now, but if I reject with a 550, won't that cause my
> MailScanner box to then generate the bounce back to the original server?
>
> Foreign Server -> TLS-MailScanner -> TLS-Toaster
>
> How are others Using MailScanner in front of pop toasters handling this
> issue? It is looking as if moving the "User Check" to the MailScanner
> machine _is_ my one good option.
>
> Thanks,
>
> DAve
>

Dave

not if you 550 reject on the inbound MTA. It never goes anywhere near
MS, it simply drops the inbound connection with a "550 no such address".

Any mistyped email address from a real user will get that message, ie
they get a proper bounce message from their MTA.

Any spam attempts from automated/trojaned machines will just ignore it
and carry on to the next victim.

--
Martin Hepworth
Snr Systems Administrator
Solid State Logic
Tel: +44 (0)1865 842300



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