Help needed, I'm blocked in debugging email config (Infomaniak/Brevo)

Installation
12

it is not :sob:

root@server-1:/var/discourse# time openssl s_client -starttls smtp -connect smtp-relay.sendinblue.com:587 </dev/null > /dev/null
depth=2 C = US, ST = New Jersey, L = Jersey City, O = The USERTRUST Network, CN = USERTrust RSA Certification Authority
verify return:1
depth=1 C = GB, ST = Greater Manchester, L = Salford, O = Sectigo Limited, CN = Sectigo RSA Domain Validation Secure Server CA
verify return:1
depth=0 CN = *.sendinblue.com
verify return:1
250 STARTTLS
DONE

real	0m0.126s
user	0m0.003s
sys	0m0.007s
root@server-1:/var/discourse# docker run --rm discourse/base:2.0.20231023-1945 bash -c 'time openssl s_client -starttls smtp -connect smtp-relay.sendinblue.com:587 </dev/null' > /dev/null
depth=2 C = US, ST = New Jersey, L = Jersey City, O = The USERTRUST Network, CN = USERTrust RSA Certification Authority
verify return:1
depth=1 C = GB, ST = Greater Manchester, L = Salford, O = Sectigo Limited, CN = Sectigo RSA Domain Validation Secure Server CA
verify return:1
depth=0 CN = *.sendinblue.com
verify return:1
250 STARTTLS
DONE

real	0m8.125s
user	0m0.007s
sys	0m0.000s

… should I uninstall / reinstall docker ?
I only did some apt commands and let it by default from docker-ce, so I don’t know what can be wrong…

the only mod I did was to add the dns as suggested in another post because I first had “unknown host” errors

root@server-1:/var/discourse# cat /etc/docker/daemon.json
{
  "dns": ["83.166.143.51", "83.166.143.52", "8.8.8.8"]
}