On 2025-02-13 16:54, Mike Hammett via mailop wrote:
I'm trying to send an email to a well-known mailing list (voiceops). My mail
server (Proxmox Mail Gateway) seems to be skipping over the server at
preference 0 and is trying to send to preference 10. My issue is that the mail
server at preference 0 has both IPv4 and IPv6 addresses, but the one at
preference 10 only has an IPv6. I am IPv4-only, so we can't communicate.
I already have a relationship with Jared, so I can work out the technical
aspects of his free and appreciated service. I'm trying to figure out why I
would have skipped over the supposedly preferred server to talk to the less
preferred server.
I looked at the Postfix source (based on another comment in the thread
that Proxmox Mail Gateway uses Postfix). I can't immediately see any
reason it would skip a 0 MX.
I'd be curious what you see for DNS lookups in a packet capture, as
suggested in other emails in this thread.
If there is any evidence of a DNS problem, let me know. I am responsible
for the DNS hosting for voiceops.org, as it is hosted with wiktel.com.
I could change that 0 to some other value to see if that matters. (I do
have the voiceops.org registrant's permission to do so.) My _personal_
feeling is that if we are going to do that, before doing so, it would be
nice to have solid proof that your mail server got the right DNS
records. Because if Postfix is skipping a 0 MX, that seems like a bug,
and having solid evidence of it would be helpful.
--
Richard
_______________________________________________
mailop mailing list
mailop@mailop.org
https://list.mailop.org/listinfo/mailop
