You're discussing DNS based solutions to spam (as in, if MX != PTR then bin it) ... yet nobody (in the last 3 months...) from what I can recall has even mentioned SPF once...
what? SPF is a "DNS-based solution"
and it's actually a fairly powerful way of blocking spam... or will be!
Not at all clear whether SPF if method of blacklisting or whitelisting.
No SPF records? cannot reject, because only a tiny %age of domains have SPF records.
msg complies with SPF record? yes, but cannot accept because spammers use SPF and some legit servers set up extremely generous SPF records and/or "all"
msg doesn't comply with SPF record? no, but cannot reject because the msg maybe forwarded, etc, etc.
when the majority of people are running SPF, , you'll see a shift where people change from allowing mail from hosts WITHOUT spf records, to blocking mail from hosts without SPF records... as it stands now, if your sending from a hacked/spam server and it's not listed in a domains SPF record.. It's rejected.
This is something _VERY_ simple to setup... and certainly a 'way forward'...
Then why, at this fairly advanced stage of SPF availability, have only tiny %age of domains set up SPF reocrds?
Why at this extremely advanced stage of PTR availability, 20 years!, have not ALL legit business mailserver setup up any PTR record?
Len
_____________________________________________________________________ http://IMGate.MEIway.com : free anti-spam gateway, runs on 1000's of sites
To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
