Magnus Holmgren wrote:
On Monday 27 August 2007 15:26, Marc Perkel wrote:
Jason Bertoch wrote:
I think it's safe to say I'm not in the minority when I receive
SPF-Compliant spam. I'm looking for opinions on what we can honestly
derive from such messages regarding the sending server's IP and the
sending address' domain name. Is it wise to blacklist both, or is this
yet another case where SPF has failed to meet projections?
SPF breaks email forwarding. I haven't found anything I can't use it for
that's useful.
SPF does not in itself break email forwarding. SPF tells MTAs where mail with
certain senders may originate from. It's their job to know if the recipient
forwards mail from the connecting host. It can be tricky, but it's not
impossible in principle. Applying SPF without thinking is incompetent and
will cause false positives.
Yes it does break email forwarding because if you have restrictive SPF
and it gets forwarded then the forwarding server isn't a valid server.
Thus if the receiving server enforces SPF rules then it bounces the
forwared message.
