Am 29.11.23 um 16:51 schrieb John Levine via Exim-users:
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<[email protected]> 
 qp 83701 uid 82
2023-11-29 10:35:50.726425500 starting delivery 466243: msg 271522 to 
[email protected]
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

Looks like an issue on your side:

[marius@eve ~]$ openssl s_client -connect [2a03:4000:6:b381::2]:25 -starttls smtp -no_renegotiation
CONNECTED(00000003)
Can't use SSL_get_servername
depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = R3
verify return:1
depth=0 CN = *cumin.exim.org*
...
250 HELP
helo s113.not-included.com
250 cumin.exim.org Hello s113.not-included.com [2001:9e8:69c9:a300:334b:2782:3ec5:e777]
mail from: <[email protected]>
250 OK
rcpt to: <[email protected]>
*250 Accepted

*Just test it on your server with the openssl command above and fill in what your server would use as name and sender address.

best regards,
Marius

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