SMTP Mails don't send and connection fails, but openssl works

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So you are having a networking problem in the container, but it stems from DNS not IP connectivity.

Are you able to connect using openssl s_client to the hostname from inside the container?

You should be able to run:

openssl s_client -connect smtp-relay.brevo.com:587 -starttls smtp

and get:

…
Verify return code: 0 (ok)
…

That’s expected since you’re connecting to an IP address and that IP address won’t be on the cert.

It will.

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