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

[Sam Grabham <sam@xxxxxxxxxxxxxxxxx>]

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.

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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