Mail server error trying to connect to pterodactyl panel


So I tried to connect my mail server to my pterodactyl mail and clicked test email, but I keep getting this error:

An error occurred while attempting to test mail settings: Unable to connect with STARTTLS: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages:
error:0A000086:SSL routines::certificate verify failed

This is probably a problem with the mail SSL generated.
Does some know how to fix this?

I got it fixed what I had to do:

postmap -F hash:/etc/postfix/
systemctl restart postfix

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