are outgoing mails scan by Clam and SA

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are outgoing mails scan by Clam and SA

Kebba Foon
Dear List,

our network administrator are having issues with smtp traffice (we are  
an ISP) most of our customer's IP are sending spam, this is giving a  
bad reputation on our IP's on the rbl's. they are suggesting that all  
smtp traffic from our customers be forwarded to our mail server and  
the the server will check for malform mails, scan the mails and then  
further forward them to their destination. my question is:

1. those exim4u scan outgoing mails
2. is it a good idea to go about this setup?
3. is there any other best solutions.

Thanks
Kebba


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Re: are outgoing mails scan by Clam and SA

gldickens3
Administrator
Hi Kebba,

The stock Exim4U config is not setup to scan outgoing mail for spam.  
However, you could modify Exim4U's exim configuration file
(/etc/exim/exim.conf) to scan outgoing mail by modifying the ACLs to
remove the appropriate accept statements prior to the various spam
checks.  For example, to have all authenticated mail go through all of
the same spam checks as incoming mail, try commenting out the following
statement from the beginning of all of the ACLs:

accept authenticated = *

Obviously, you would need to thoroughly test any modifications such as this.

It sounds like you are interested in setting up Exim4U as a relay host
and then to have it do spam checks.  This can also be done but you would
need to modify the ACLs in the exim configuration file to accept mail
from the relaying server but to then do the spam checks.

As an aside, Exim4U does have the ability to ratelimit outgoing mail
from internal accounts' to prevent abuse.  This is done in the file:

/etc/exim/exim4u_local_rl.conf.inc.

The ratelimiting done by this file using the stock Exim4U configuration
is very conservative so as to not disrupt any legitimate senders,
however, this file is fairly well self documented and you can modify the
ratelimiting parameters in this file to be more aggressive to match your
needs.

FYI,

Gordon



On 02/07/2011 12:58 PM, [hidden email] wrote:

> Dear List,
>
> our network administrator are having issues with smtp traffice (we are
> an ISP) most of our customer's IP are sending spam, this is giving a
> bad reputation on our IP's on the rbl's. they are suggesting that all
> smtp traffic from our customers be forwarded to our mail server and
> the the server will check for malform mails, scan the mails and then
> further forward them to their destination. my question is:
>
> 1. those exim4u scan outgoing mails
> 2. is it a good idea to go about this setup?
> 3. is there any other best solutions.
>
> Thanks
> Kebba
>
>
> _______________________________________________
> users mailing list
> [hidden email]
> https://exim4u.org/mailman/listinfo/users


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