Msg#: 10506 posted 1:58 pm on Dec 16, 2005 (gmt 0)
Which one gives this message? Not both the same, surely. There's something strange about this because if they were rejecting all non-SPF mail they'd be rejecting most of the mail they got. Personally I've found the mail administrators for NTL particularly useless. They have a large captive clientele of tech-ignorant users so they think they can do whatever they want and if the mail doesn't get through, that's too bad.
If your mail server is remotely hosted you could ask your host for advice about publishing SPF records. If you host it yourself you can probably find the information you need at the SPF website [openspf.org]. Just don't hold out too much hope that that will solve your problems.
Msg#: 10506 posted 4:20 pm on Dec 16, 2005 (gmt 0)
SPF records have been required by several major ISPs for over a year. IMO, any host worth their fees should be able to help out their customers on this issue -- I've had the problem fixed for several smaller clients who were remotely hosted just by getting the information to their tech department (including information from the ISPs about requiring the SPF.) And this was a year back -- the information should surely have circulated through the hosting industry by now.
Msg#: 10506 posted 7:42 pm on Dec 16, 2005 (gmt 0)
If your ISP publishes its SPF record then you're good to go; the ISP domain can be included in your host SPF record. See the SPF Wizard page [openspf.org]. Even if not, surely your ISP only sends your mail from one mailserver, so the IP address of that machine could be added to your SPF record.
Msg#: 10506 posted 4:28 pm on Dec 19, 2005 (gmt 0)
It appears some but not all ISP's mangle the message header when relaying email to domain mailservers.
That might explain why I see these every now and then...
The following addresses had permanent fatal errors ----- <firstname.lastname@example.org> (reason: 554 refused mailfrom because of SPF policy) ----- Transcript of session follows ----- ... while talking to smtp.secureserver.net.: >>> MAIL From:<email@example.com> SIZE=10475 <<< 554 refused mailfrom because of SPF policy 554 5.0.0 Service unavailable
We've been using SPF since the first week it was official, I believe that was about 18 months ago. Every now and then we get the above messages.