[tacticalogic]

The large players could implement Certs for their mail relays, but given the difficulty most locations have with simply running a virus scan on an infected PC, this would also create lots of delivery issues.

Just getting everyone to implement SPF records, and then require a valid SPF resolution before accepting the mail would fix the spambots.

[dfrussell]

Just getting everyone to implement SPF records, and then require a valid SPF resolution before accepting the mail would fix the spambots.

Possibly, but SPF isn't likely to become widespread because many people use a return address unrelated to a sending site and SPF would eliminate this ability.

This means that you wouldn't be able to use your business address from hotmail and vice versa.