Email media type does not works : SSL connect error

[llinty]

Hello,

I have configured my media type emai las following. Copy/paste credentials are ok. I have this mesage when I click on "Test"

SSL connect error: OpenSSL/3.0.11: error:0A00010B:SSL routines::wrong version numberhello,

Please advise.

[tim.mooney]

You've selected explicit SSL/TLS on port 587, rather than STARTTLS on port 587. That's possible, but it's what I would call a non-standard configuration. The error you're getting is similar to what I would expect if port 587 is plaintext (with possible support for STARTTLS) rather than SSL/TLS. You probably want to try switching the Zabbix config to STARTTLS and see if that works.

You can verify what the remote port needs using either telnet or openssl (the s_client subcommand).

You may want to read up on STARTTLS vs. SSL/TLS, perhaps something like https://mailtrap.io/blog/starttls-ssl-tls/

Also, if you're going to require encryption, why not also check "verify host"? Are you using self-signed certs on the remote mail server?

[llinty]

Hi Tim,

thank you for your message. I agree that it should be SSL/TLS. When I choose this option and perform a email test it says : An authentication function returned an error

I'm sure that credential are correct because I'm using a password manager software. It wokrs with these credentials on Outlook - Web Access. I also have tick on Verify Host option.

I can connect to SMTP 587 using openssl.

openssl s_client -starttls smtp -connect my.stmp.server:587
CONNECTED(00000003)
...