Re: Need help solving a Sender/From address dilemma

On 04/26/2010 02:06 PM, Russell Robinson wrote:
> The return-path is a random valid email address, which has nothing to do 
> with amazon.com.

but i'd wager that if you look at the headers of that message, you'll 
see it was sent from a non-Amazon mail server. that's how you tell the 
legitimate messages apart from the forgeries. it's something your MTA 
can decipher; it can compare the return-path address with the server 
that is trying to send the message to you. real amazon.com email will be 
sent from an *.amazon.com server. the same is true for other large sites 
like gmail, hotmail, AOL, etc. i've been doing this for years under 
Postifx using a method similar to this:

http://articles.techrepublic.com.com/5100-10878_11-5056088.html

i'm sure Exim can do the same, so i'd do some googling on that subject 
or inquire within the Exim forums about how.


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