Scott Kitterman wrote:
Are you implying that B should deliver undeliverable mail to
a local spam folder ?
No. I'm saying that if the mail can't be rejected due to SPF during the
SMTP session, then it shouldn't be bounced. It should be delivered.
Great conversation guys, you're hitting a lot of nails right on the head :)
A is the real sender at home, B is the dial up ISP, C checks SPF
and rejects, D is the victim because B bounces the message.
A--->B--x-->C
B--->D
However, in this example, whether mail rejected @ C can be rejected @ B,
or will be bounced to D depends on whether the ISP B implemenent
"interractive" delivery of submitted mail or "deferred/queued" delivery.
After a few complaints to the ISP B from parties like D, the ISP may
well opt to enable interactive delivery, which will eliminate the need
to bounce to D. For small ISPs, interactive delivery may be a viable option.
Regards,
Radu