Stephen Atkins:
> My main goal is to figure out what I should
> have in each section of main.cf (smptd/client restrictions to help stop
> spam
There is no universal solution against spam. Some people don't
tolerate false negatives (spam not blocked), and some people don't
tolerate false positives (blocked non-spam).
> and not to be a open relay or back scatter host.
That's easy: don't accept-then-bounce. This means reject non-existent
recipients before mail enters your mail queue. If you have to block
spam after it enters your mail queue, quarantine if if you must,
discard it if it contains known malware.
Wietse
