Hi,

I don't know what this error entails but I took a peek at the source and found this in mta.c around lines 1575:

                if ((c->source->sa &&
                     c->source->sa->sa_family != mx->host->sa->sa_family) ||
                    (l->family && l->family != mx->host->sa->sa_family)) {
                        log_debug("debug: mta-routing: skipping host %s: AF mism
atch",
                            mta_host_to_text(mx->host));
                        family_mismatch = 1;
                        continue;
                }

notice there is a DEBUG level log with a conversion indicating which host it has problems with.  Not saying you need to run it in debug mode, but you can to see this message.

Best Regards,

-peter


On 2020-07-23 09:45, Harald Dunkel wrote:
The Network error on destination MX has been resolved.
The Address family mismatch is still open.

smtpctl show queue gives me

a9f755dd88e88083|inet4|mta||u...@example.com|cont...@bugs.debian.org|cont...@bugs.debian.org|1595227438|1595227438|0|27|pending|29446|Address family mismatch on destination MXs ebbe485d057fa820|inet4|mta||u...@example.com|xxx...@bugs.debian.org|xxx...@bugs.debian.org|1595227386|1595227386|0|27|pending|29394|Address family mismatch on destination MXs

Please note the "inet4" and

% host bugs.debian.org
bugs.debian.org has address 140.211.166.212
bugs.debian.org has address 209.87.16.39
bugs.debian.org has IPv6 address 2605:bc80:3010:b00:0:deb:166:212
bugs.debian.org has IPv6 address 2607:f8f0:614:1::1274:39
bugs.debian.org mail is handled by 10 buxtehude.debian.org.
% host buxtehude.debian.org.
buxtehude.debian.org has address 209.87.16.39
buxtehude.debian.org has IPv6 address 2607:f8f0:614:1::1274:39
buxtehude.debian.org mail is handled by 10 mailly.debian.org.
buxtehude.debian.org mail is handled by 10 muffat.debian.org.


Currently telnet 140.211.166.212 smtp fails with Connection refused, but
where is the address family mismatch between inet4 and 209.87.16.39 ?


Regards
Harri


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