[Mailman-Users] Sending domain does not exist but it actually does?

[Mark Sapiro]

On 03/22/2018 11:14 AM, Jayson Smith wrote:
> FYI the host in question is bluegrasspals.com. It does have an A record,
> and its ip has proper reverse nslookup back to the domain. My host
> supports IPV6 but I'm not using it for mail.


That should be OK assuming as Dimitri Maziuk says you have
"inet_protocols = ipv4" in your postfix config (or the
equivalent for your MTA).

However, I note the domain doesn't have an MX. That should be OK as it
does have an A, but since plus.com is apparently misbehaving, we have no
clue as to what they are looking at, and adding an MX may help.

-- 
Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan