March 7, 2016
1:35 a.m.
Mark Sapiro writes:
On 03/06/2016 09:37 AM, Barry Warsaw wrote:
On Mar 05, 2016, at 04:14 PM, Mark Sapiro wrote:
The issue is that there is an MX record for mailman3.org pointing to mail.mailman3.org, but mail.mailman3.org doesn't have an A record; it has a CNAME pointing to mailman.iad1.psf.io which is the canonical name of the server. ... Fixed by setting mail. to an A record. Give it time to propagate, and it has a 3h TTL.
Looks good. Thanks Barry.
But note that as a practical matter some receiving sites demand (or use to demand) that a sender's PTR roundtrip (ie, A -> PTR -> same A).
Is that not a problem any more?
Steve