[Cialug] Sendmail spam rejection

[albus]

Not sure this will help but I found this so far.

http://sourceforge.net/projects/mail-checkuser/



----- Original Message ----- 
From: "Daniel A. Ramaley" <daniel.ramaley at DRAKE.EDU>
To: "Central Iowa Linux Users Group" <cialug at cialug.org>
Sent: Tuesday, October 24, 2006 4:05 PM
Subject: [Cialug] Sendmail spam rejection


>I have what is hopefully an easy question for the sendmail wizards on 
> this list. I have 2 mail servers. The first receives mail from the 
> outside world, filters out most of the spam, and then passes the mail 
> to the second server (which is what users actually log in to to check 
> their mail). The first server runs sendmail. It does not currently have 
> a way to verify the recipient addresses, so it just accepts all mail 
> for the domain. Then when the first server forwards mail on to the 
> second server, any invalid recipients cause a bounce to be generated.
> 
> I would prefer for the first server to never accept invalid recipients 
> in the first place, before running expensive spam checks and clogging 
> up the second server with bounces that usually never go anywhere. I 
> have a nightly data feed with a list of valid recipients. What is the 
> best way to load that list on to the first mail server and make 
> sendmail check it as soon as it has received a recipient address?
> 
> 
> So far Google has not been quite as helpful as i would have liked 
> (probably because i'm not familiar enough with sendmail to search the 
> correct terms), but i've found 2 possibilities. I don't know whether 
> they are plausible, though. One would be to set up a virtusertable hash 
> file with a list of valid recipients (all 20 000 of them), but i think 
> that is mostly used to rewrite addresses. I don't want to rewrite 
> addresses, i just want to have a list of valid ones and deny the rest:
>    user1 at example.com    user1 at example.com
>    user2 at example.com    user2 at example.com
>    ...
>    @example.com         error:"550 We do not accept spam"
> 
> Would that work? If not, the other idea i've seen would be to set up 
> sendmail's ldap_routing feature, but instead of using real LDAP, use a 
> hash table. Unfortunately, i've not yet found understandable 
> instructions on how to use the ldap_routing with a hash file.
> 
> ------------------------------------------------------------------------
> Dan Ramaley                            Dial Center 118, Drake University
> Network Programmer/Analyst             2407 Carpenter Ave
> +1 515 271-4540                        Des Moines IA 50311 USA
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