Postfix relay let's encrypt?

Question

postfix

Hello. help solve the problem with the hit of mail on gmail in spam. There are two servers - main and second (relay). the second e-mail server is registered on the main server as a relay only for the mail that goes to gmail. I do not have access to the main server, I only configured the second server. Mail through it goes to gmail but gets into spam. Both servers do not have certificates configured. Can I set up certificates on the second server only? and will it help to prevent mail from being spammed on gmail?

Answer 1

We are still hardly talking about such certificates, most likely gmail complains about DKIM (for tls you can get by with self-sign), set up SPF & DKIM - it should be enough for delivery to Google.