[courier-users] submission problems

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Hi,

I updated my courier-mta server from version 1.1.8 to 1.1.10.

It starts up without problems, imap over ssl also works (port 993).
But when I try to use smtp over ssl (port 465), it does not work anymore as before.
It fails to establish an encrypted connection:

---8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---
# openssl s_client -host 127.0.0.1 -port 465 -showcerts </dev/null
CONNECTED(00000003)
write:errno=104
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 0 bytes and written 297 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---
--->8--->8--->8--->8--->8--->8--->8--->8--->8--->8--->8--->8--->8---

---8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---
# openssl s_client -host 127.0.0.1 -port 993 -showcerts </dev/null
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 = szilassi.eckner.net
verify return:1
---
Certificate chain
 0 s:CN = szilassi.eckner.net
   i:C = US, O = Let's Encrypt, CN = R3
   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
   v:NotBefore: Dec 29 02:04:38 2022 GMT; NotAfter: Mar 29 02:04:37 2023 GMT
-----BEGIN CERTIFICATE-----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kDF9V/TvgygvhRHOvlyTnHtwDz4dTRvG
-----END CERTIFICATE-----
 1 s:C = US, O = Let's Encrypt, CN = R3
   i:C = US, O = Internet Security Research Group, CN = ISRG Root X1
   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
   v:NotBefore: Sep  4 00:00:00 2020 GMT; NotAfter: Sep 15 16:00:00 2025 GMT
-----BEGIN CERTIFICATE-----
MIIFFjCCAv6gAwIBAgIRAJErCErPDBinU/bWLiWnX1owDQYJKoZIhvcNAQELBQAw
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
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hCExroL1+7mryIkXPeFM5TgO9r0rvZaBFOvV2z0gp35Z0+L4WPlbuEjN/lxPFin+
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MldlTTKB3zhThV1+XWYp6rjd5JW1zbVWEkLNxE7GJThEUG3szgBVGP7pSWTUTsqX
nLRbwHOoq7hHwg==
-----END CERTIFICATE-----
 2 s:C = US, O = Internet Security Research Group, CN = ISRG Root X1
   i:O = Digital Signature Trust Co., CN = DST Root CA X3
   a:PKEY: rsaEncryption, 4096 (bit); sigalg: RSA-SHA256
   v:NotBefore: Jan 20 19:14:03 2021 GMT; NotAfter: Sep 30 18:14:03 2024 GMT
-----BEGIN CERTIFICATE-----
MIIFYDCCBEigAwIBAgIQQAF3ITfU6UK47naqPGQKtzANBgkqhkiG9w0BAQsFADA/
MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT
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Dfvp7OOGAN6dEOM4+qR9sdjoSYKEBpsr6GtPAQw4dy753ec5
-----END CERTIFICATE-----
---
Server certificate
subject=CN = szilassi.eckner.net
issuer=C = US, O = Let's Encrypt, CN = R3
---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: RSA-PSS
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 4620 bytes and written 377 bytes
Verification: OK
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 2048 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---
DONE
--->8--->8--->8--->8--->8--->8--->8--->8--->8--->8--->8--->8--->8---

I'm pretty clueless, where to look.
The system logs of courier show nothing during the connection attempt (neither with my mail client nor with openssl's s_client).

I hope, someone has an idea, what is going on / what I broke.

regards,
Erich

P.S.: I had to send this mail via sendmail from my mailserver :-(