I've been doing that for years. Unfortunately, there's a fly in the ointment that seems to have been triggered by moving to a different virtual host on the same

I've been doing that for years. Unfortunately, there's a fly in the ointment that seems to have been triggered by moving to a different virtual host on the same provider. AT&T has my new IP address on its own private RBL for some reason, even though a multi-RBL check at mail-abuse.org shows zero hits. SPF+DKIM apparently isn't good enough for them. I have no problems sending mail to people on Comcast, Yahoo, GMail, or anywhere else - just AT&T domains. I don't send out large volumes of email, nobody else is abusing my server, and attempts to resolve this go nowhere.