Re: [LUG] Sendmail - Clone all incoming email to compare spam filters?

[Gordon Henderson <gordon+dcglug@xxxxxxxxxx>]

On Thu, 25 Mar 2010, Sam Grabham wrote:

> Hi Gordon
>
> Yes it would be the "one acting as a switch to send the message to 2 servers 
> downstream? " option, so what should i put in the /etc/mail/aliases file to 
> make this work?
> I have forward to groups, like sales in the past, but never forward all email 
> to another before. I would have use the smart host option.
Ah, lots of emails... not just one address.. Hm.

In which case I can't think of anything easy off-hand.

If you had a complete list of emails, then in /etc/aliases:

gordon:         gordon@xxxxxxxxxxxxxxx,gordon@xxxxxxxxxxxxxxx
sam:            sam@xxxxxxxxxxxxxxx,sam@xxxxxxxxxxxxxxx

where  test1.local.com would need to be a MX record pointing to the local 
server - same for test2.local.com.... (you might get away with
gordon:  gordon@[192.168.42.45], gordon@[192.168.42.46]

though.

Remember to accept emails to the domain on each test server - 
/etc/mail/local-host-names needs an entry for each domain it's accepting 
email for.
Gordon



> Regards
>
> Sam
>
>
> Gordon Henderson wrote:
> > On Thu, 25 Mar 2010, Sam Grabham wrote:
> >
> > > Hi
> > >
> > > Does anyone know how to clone all incoming email traffic to 2 separate 
> > > smtp servers.
> > > I want to prove a concept but need the same emails on both servers to 
> > > compare.
> > > have looked for a milter, but nothing seems to do what i want.
> > >
> > > have tried 
> > > "define(`SMART_HOST',`[exchange2007.xxxxxxxxx.co.uk]:[jessie.xxxxxxxxx.co.uk]')" 
> > > but this chooses the first server only, if on-line.
> > > have looked at a milter called  SYNONYM - The Mail ARCHiver 
> > > (http://www.modulo.ro/synonym)
> > > are there any INPUT_MAIL_FILTER options in sendmail i could use?
> > I am not going to open my copy of the bat book...
> >
> > However - won't this affect the 2nd server - as the email will have headers 
> > added by the first? Or do you realy have 3 servers - one acting as a switch 
> > to send the message to 2 servers downstream?
> > If you have 3, you could simply use the /etc/mail/aliases on the incoming 
> > server and send it to the 2 other servers - they'd at least get the same 
> > headers, but wouldn't be able to use any IP address based blacklisting 
> > unless the rules were really clever to scan all the headers and ignore the 
> > last sending server.
> > Watch out for backscatter though.
> >
> > Gordon
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