Sending Unencrypted E-mails

Bs Serge <[email protected]>
Newsgroups gmane.comp.jakarta.james.user
Message-ID <CAO7MO+O5pLTbfPhcofU7FasRUgL+RKAsT=VRc+c-U-RB7dV5=Q@mail.gmail.com> 
Hi again,

After configuring Reverse DNS PTR record, SPF, DKIM and DMARC, emails I
send are now out of spam and inside the inbox (of GMAIL, ...)

But they are still marked as unencrypted as you can see here:
https://ibb.co/FsLF6Lr

Even though I configured STARTTLS and generated an SSL certificate using
Letsencrypt (certbot)

I have added screenshots of other checks as well  :

- mxtoolbox.com : https://ibb.co/StSwwtP
- checktls.com : https://ibb.co/f8KHj0t
- GMAIL show original: https://ibb.co/jRwcs1w
- DMARC: https://ibb.co/VBJ0SZ1

Kindly let me know what I might be missing.

Any comments or thoughts would be appreciated.

Best Regards,
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