[Mailman-Users] Help: PTR record and ISP blocking...
rodd at ahrenstorff.us
Sat Nov 20 05:31:36 CET 2004
I've recently had a local ISP block incoming email from our mailing list
server. I'm trying to figure out why this occurred.it is not the result of
virus or spam activity. One thing I noticed: our PTR record is listed as
mail.domain.org, but it doesn't match the actual host name of the server (as
would be identified in the mail header). I've now checked the PTR records
for several domains controlled by the ISP in question, and found they don't
include a host name in the PTR record at all.
Otherwise, Mailman has been working perfectly for all other recipients.
Should I have my ISP drop the host name portion in my PTR?
Could the other ISP be attempting to verify my actual server host name
against the existing PTR record before accepting email?
Any other suggestions to keep the ISP's on my good side? (.beyond the
IT Systems Coordinator
Medical Associates of the Black Hills
rodd at mabhllc.org
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