Strange but true, sending mail to this list via IPv6 does not work:
2023-11-29 10:35:50.715699500 new msg 271522
2023-11-29 10:35:50.715750500 info msg 271522: bytes 2558 from <johnl@???> qp 83701 uid 82
2023-11-29 10:35:50.726425500 starting delivery 466243: msg 271522 to remote exim-users@???
2023-11-29 10:35:56.348847500 delivery 466243: failure: 2a03:4000:0006:b381:0000:0000:0000:0002_does_not_like_recipient./Remote_host_said:_550_unknown_user/Giving_up_on_2a03:4000:0006:b381:0000:0000:0000:0002./STARTTLS_proto=TLSv1.3;_cipher=TLS_AES_256_GCM_SHA384;_subject=/CN=cumin.exim.org;_issuer=/C=US/O=Let's_Encrypt/CN=R3;/
2023-11-29 10:35:56.376048500 end msg 271522
Sending via IPv4 works fine:
2023-11-29 10:42:06.094130500 new msg 271876
2023-11-29 10:42:06.094197500 info msg 271876: bytes 2553 from <johnl@???> qp 84826 uid 82
2023-11-29 10:42:06.106608500 starting delivery 466286: msg 271876 to remote exim-users@???
2023-11-29 10:42:14.980534500 delivery 466286: success: 37.120.190.30_accepted_message./Remote_host_said:_250_OK_id=1r8MhU-003p0a-4H/STARTTLS_proto=TLSv1.3;_cipher=TLS_AES_256_GCM_SHA384;_subject=/CN=cumin.exim.org;_issuer=/C=US/O=Let's_Encrypt/CN=R3;/
2023-11-29 10:42:14.980906500 end msg 271876
R's,
John
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