Re: [exim] HELO delays

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Συντάκτης: Andrew - Supernews
Ημερομηνία:  
Προς: exim-users
Αντικείμενο: Re: [exim] HELO delays
>>>>> "Ian" == Ian Eiloart <iane@???> writes:

>> For some months now we have used a HELO ACL to delay by 35 seconds
>> all connections with suspicious looking HELOs. This is very
>> effective at reducing the amount of spam that our servers receive,
>> while not preventing "real" email getting through, because much of
>> the current spamming software seems to drop the connection during
>> the delay period.


Ian> Is 35 seconds really necessary?


Yes.

Ian> It will fall foul of sender verification callouts,


Cart/horse inversion error. In this case it is the sender verification
callouts which are violating the protocol by timing out too soon.

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Andrew, Supernews
http://www.supernews.com