On mailman3, here is an example from early this morning and yesterday:
2023-10-31T05:22:23.134571+00:00 mailman3 postfix/smtp[25152]: 0CC6A10E7: to=<redmine+admin@progressoo.infra.opensuse.org>, relay=relay.infra.opensuse.org[192.168.47.4]:25, delay=0.08, delays=0.05/0/0/0.03, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 1E0021FA4D)
2023-10-31T08:35:27.602649+00:00 mailman3 postfix/smtp[14831]: 88E911170: to=<redmine+admin@progressoo.infra.opensuse.org>, relay=relay.infra.opensuse.org[192.168.47.4]:25, delay=0.04, delays=0.01/0.02/0/0.01, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 91BAD21452)
2023-10-31T08:39:52.952148+00:00 mailman3 postfix/smtp[15323]: D3C3A1170: to=<redmine+admin@progressoo.infra.opensuse.org>, relay=relay.infra.opensuse.org[192.168.47.4]:25, delay=0.08, delays=0.01/0.03/0.03/0.02, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as E60551FA51)
2023-10-31T08:57:18.831856+00:00 mailman3 postfix/smtp[17185]: C243A10D5: to=<redmine+admin@progressoo.infra.opensuse.org>, relay=relay.infra.opensuse.org[192.168.47.4]:25, delay=0.04, delays=0.01/0/0/0.02, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as C8F692108E)
2023-10-31T11:11:38.487836+00:00 mailman3 postfix/smtp[32632]: 6D7B6A16: to=<redmine+admin@progressoo.infra.opensuse.org>, relay=relay.infra.opensuse.org[192.168.47.4]:25, delay=0.04, delays=0.02/0/0/0.01, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 754B0211BB)
2023-10-31T18:48:41.029785+00:00 mailman3 postfix/smtp[22075]: 01F7E1324: to=<redmine+admin@progressoo.infra.opensuse.org>, relay=relay.infra.opensuse.org[192.168.47.4]:25, delay=0.02, delays=0.01/0/0/0.01, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 05E372151A)
2023-10-31T19:23:06.752417+00:00 mailman3 postfix/smtp[26308]: B284C1424: to=<redmine+admin@progressoo.infra.opensuse.org>, relay=relay.infra.opensuse.org[192.168.47.4]:25, delay=0.02, delays=0.01/0/0/0.01, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as B61A31FA51)
2023-10-31T19:23:29.854548+00:00 mailman3 postfix/smtp[26310]: CB68A1424: to=<redmine+admin@progressoo.infra.opensuse.org>, relay=relay.infra.opensuse.org[192.168.47.4]:25, delay=0.02, delays=0.01/0/0/0.01, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as CEE7A1FE28)
2023-11-01T01:27:15.079043+00:00 mailman3 postfix/smtp[3477]: 0AA6C1465: to=<redmine+admin@progressoo.infra.opensuse.org>, relay=relay.infra.opensuse.org[192.168.47.4]:25, delay=0.04, delays=0.01/0/0/0.02, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 113C8211B4)
mailman3 has a transport map that directs opensuse.org
straight to mx[12], so this cannot (should not) be happening.