[Asterisk-Users] Digium list server and spam assassin

[Tony Hoyle]

Jason Pyeron wrote:
> But the etiquette for SMTP is the HELO is done with a reverse friendly 
> name.
> 
> This 'assists' in detection of spoofed dns spamming.

It doesn't need to be the same though, only resolve to the same.

if lists.digium.com == 69.16.138.164 then it is correct, and that's all 
the spoof checking you need.

Doing the reverse check for 164.138.16.69.in-addr.arpa is unnecessary, 
and will break in a great many legitimate cases, since ISPs often don't 
allow the reverse dns to be set independently (even for corporate networks).

The network scores for FORGED_RCVD_HELO, btw. are 0.05 (no bayes), and 0 
(with bayes)

That means that if you have bayes enabled it's a no-op, and even with no 
bayes you're only going to be adding 0.05 to the score... it'd need 100 
other scores like that to be spam.

Tony