Anti-spam SMTP mods

[Brian Densmore]

>-----Original Message-----
>From:	Charles Steinkuehler
>
>Has anyone on-list implemeted SPF (http://spf.pobox.com/) or one of the 
>other 2 methods currently being proposed to close the loopholes in SMTP 
>that allow forging of the envelop sender/from: header?
>
>I'm thinking of setting this up on my personal mail server, but am 
>wondering if it will be worth the hassle.
I have a simple solution on my mail server. Only local users can create mail
locally, and I only allow trused users to send mail. Now granted if a 
local user wanted to spoof the headers I don't know that my server is
smart enough to prevent it. My old rules in postfix would have altered the sender info to state the 
email headers as forged. I haven't written any custom rules for exim yet (just downloaded the 
documentation this morning).

Is the SPF implementation hard? I may look into as my new lean mean debian server is using less 
than 300 MB total installed software so far (web+mail+webmail).

Brian