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Exim hates IPv6
exim-users at lists
Nov 29, 2023, 7:51 AM
Post #1 of 3 (103 views)
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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@taugh.com> qp 83701 uid 82
2023-11-29 10:35:50.726425500 starting delivery 466243: msg 271522 to remote exim-users@lists.exim.org
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@taugh.com> qp 84826 uid 82
2023-11-29 10:42:06.106608500 starting delivery 466286: msg 271876 to remote exim-users@lists.exim.org
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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Re: Exim hates IPv6 [ In reply to ]
exim-users at lists
Nov 30, 2023, 2:38 AM
Post #2 of 3 (103 views)
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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<johnl@taugh.com> qp 83701 uid 82
> 2023-11-29 10:35:50.726425500 starting delivery 466243: msg 271522 to remoteexim-users@lists.exim.org
> 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: <me@trustme.de>
250 OK
rcpt to: <exim-users@lists.exim.org>
*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

Attached Files:

Re: Exim hates IPv6 [ In reply to ]
exim-users at lists
Nov 30, 2023, 2:59 AM
Post #3 of 3 (103 views)
Permalink
On 11/29/23 15:51, John Levine via Exim-users wrote:
> 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@taugh.com> qp 83701 uid 82
> 2023-11-29 10:35:50.726425500 starting delivery 466243: msg 271522 to remote exim-users@lists.exim.org
> 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

Our log says that message was aimed at exim-users@cumin.exim.org
wheras this

> 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@taugh.com> qp 84826 uid 82
> 2023-11-29 10:42:06.106608500 starting delivery 466286: msg 271876 to remote exim-users@lists.exim.org
> 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

was to exim-users@lists.exim.org

--
Cheers,
Jeremy


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