Re: [exim] Blocking non-authenticated senders

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Autor: ROGERS Richard
Datum:  
To: David Woodhouse, Peter Velan
CC: Exim Users Mailing List
Betreff: Re: [exim] Blocking non-authenticated senders
David Woodhouse wrote:
> On Tue, 2007-02-20 at 15:38 +0100, Peter Velan wrote:
>> I don't see a situation where a foreign server sends me a legit email
>> with envelope-from = "localpart@???"?
>
> If there is any external email address for which email is just
> automatically forwarded to your systems, and if any of your users
> send mail to that address, then it'll happen.


On the other hand, the vast majority of messages that have identical
envelope FROM and RCPT addresses are spam (here at least). So IF you
provide your users with a per-user whitelist system then you could
consider blocking that class of messages - that way you have a cheap and
effective check that your users can easily bypass if they need to.

You may also want to consider blocking
nonexistent-local-part@???, but I think David is right, it's
probably wise to steer away from a "blanket" block on
any-address@??? !

Regards

Richard

--
Richard Rogers
IT Development and Innovation Manager
Staffordshire University


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