How to disable telnet to port 25

[Perry E. Metzger]

The Al Capone of the Info Highway says:
> A while back, there was a discussion about how to fake a from
> address by telneting into port 25 in a site. Many people discussed
> the pro's and cons, but I wanted to know if anybody knows of a way
> to stop people from getting in there to send the message in the
> first place.

Sure. Turn off mail to your site.

Beyond that, the store and forward nature of mail makes it impossible
to stop this. The only real solution is to require digital signatures
on all email.

Perry