On 1/29/2021 12:01 PM, Jack Lenox via Mailman-users wrote:
Hello all,
I've spent more time than I care to admit trying to configure Mailman. And I almost have it all working now, but I just can't seem to get my Mailman/Postfix combo to receive emails.
When I try to send emails to lists I'm rebuffed with undelivered notices with:
<testlist@lists.fiftyshadesof.green>: Host or domain name not found. Name service error for name=lists type=AAAA: Host not found and: <testlist@lists.fiftyshadesof.green>: Host or domain name not found. Name service error for name=lists.fiftyshadesof.green type=MX: Host not found, try again
This to me appears to be an issue with my DNS settings, but I can't work this out either. I have an A record for lists.fiftyshadesof.green pointing at my server, and an MX record pointing at that:
lists.fiftyshadesof.green. 0 IN MX 0 lists.fiftyshadesof.green. lists.fiftyshadesof.green. 0 IN A 193.37.35.191
I have driven myself mad with this and would very much appreciate any advice anyone can offer.
The key here isn't in your mailman config, or even your postfix config (you might be able to fix it there, I'm not sure). The key is in the error:
<testlist@lists.fiftyshadesof.green>: Host or domain name not found. Name service error for name=lists type=AAAA: Host not found
Specifically, type=AAAA. It's looking for an IPv6 host record and you don't have one. I'm going to guess you got that bounce not from your lists host, rather from your mail relay? Somewhere along the way something is trying to use IPv6 and needs to get kicked to either not do that or at least fall back to IPv4.
-- Joel Lord