SMTP without encryption

[ciphermenial]

I host my outbound SMTP server locally and is only accessible from my containers. I do not have encryption enabled on it because I see no reason to. I leave MAIL_ENCRYPTION empty but when doing a test receive the following:

In SocketStream.php line 171:

  Unable to connect with STARTTLS: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error me
  ssages:
  error:0A000086:SSL routines::certificate verify failed

[ciphermenial]

Nevermind. Looking like it is working as intended. https://symfony.com/doc/current/mailer.html#tls-peer-verification