Re: [exim] Using ACL to bounce undeliverable messages

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Author: Ian Eiloart
Date:  
To: ikearns, exim-users
Subject: Re: [exim] Using ACL to bounce undeliverable messages


--On 2 November 2007 05:43:04 -0700 ikearns <iankearns@???> wrote:

>
> This is all part of an inherited legacy network which forms part of a
> store and forward platform; we accept all email for users domains and
> then deliver to either local mailbox on pop3 backend server or store and
> dequeue to remote customers SMTP server when available. At this border
> point there is email evaluation based on the likelihood of it being SPAM
> but this is only scoring and not actual dropping of messages.
>
> The new Exim srver which I put it to do AV (via ClamAV) scanning is now
> the core server as it is more reliable compared to the historic Windows
> based! server that was originally in there but what is presenting an
> issue is the amount of SPAM that appears to get through and then bouncing
> causing us to be on various SPAM lists.
>
> Doing a call forward at the point this Exim server is in the network is
> not possible cause a] the email has already been received by the border
> and b] in the event that a users mailserver is offline then a call
> forward will not be possible and we would normally be expected to hold
> this mail until the customers server is responding.
>
> I was just hoping that something was possible to reduce the amount of
> bounced messages which results in this server being blacklisted


Please don't top post.

There is something that you can do. Move your Exim server to the edge of
your network.

Alternatively (but it's not very good), check the spam score before
bouncing.

>
> Ian Eiloart wrote:
>>
>>
>>
>> --On 2 November 2007 03:08:11 -0700 ikearns <iankearns@???> wrote:
>>
>>>
>>> One of my servers has been listed on SpamCop (due to bounced messages
>>> http://spamcop.net/fom-serve/cache/329.html#bounces) and after trawling
>>> the SpamCop forum I found:-
>>>
>>> http://forum.spamcop.net/forums/index.php?showtopic=8806
>>>
>>> "My previous host used Exim and all our undeliverable mail was rejected
>>> and, as I recall, it was accomplished through an ACL."
>>>
>>> Can anyone suggest an ACL that would assist in this?
>>
>> 1. Don't accept email from your domains unless it's authenticated, or
>> has been through your server.
>>
>> 2. When you do accept email, do a call forward.
>>
>> 3. Do you spam and virus checking from ACLs. As far as I can tell, this
>> means using spamassassin and clamav.
>>
>>> I have only been using LINUX/Exim for about 2 months so my confidence
>>> and knowledge are not very advanced
>>> --
>>> View this message in context:
>>> http://www.nabble.com/Using-ACL-to-bounce-undeliverable-messages-tf4736
>>> 43 0.html#a13544768 Sent from the Exim Users mailing list archive at
>>> Nabble.com.
>>
>>
>>
>> --
>> Ian Eiloart
>> IT Services, University of Sussex
>> x3148
>>
>> --
>> ## List details at http://lists.exim.org/mailman/listinfo/exim-users
>> ## Exim details at http://www.exim.org/
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>>
>>
>
> --
> View this message in context:
> http://www.nabble.com/Using-ACL-to-bounce-undeliverable-messages-tf473643
> 0.html#a13546952 Sent from the Exim Users mailing list archive at
> Nabble.com.




--
Ian Eiloart
IT Services, University of Sussex
x3148