Sending Unencrypted E-mails

Hi all,

I configured SSL in james server with my domain name and everything is
going well, I can send and receive emails with users of the domain name
from outside SMTP servers. I followed this guide[1]

But the emails I send go directly into the spam folder (of GMAIL, .... )
and are marked as unencrypted while I'm using STARTTLS and i'm passing all
TLS checks here[2] with 114 max score and the thunderbird client is not
giving any security warnings.

Any idea why this might happen?

Any comment or thoughts would be appreciated!

[1] https://robertmunn.com/blog/configuring-ssl-in-apache-james/
[2] https://www.checktls.com/TestReceiver

Best Regards,