I thought I was having a problem like this from trying to access my email from my computer. Then, later I couldn't get into FreeBSD forums, so I thought, this wasn't a similar problem.
I upgraded GNUTLS, and the forums worked. Then, I upgraded NSS and I could access my email. I had a similar problem from when I needed to upgrade an encryption dependency for OMEMO to work on XMPP. With the latest issues of a browser or application, this has happened, because of an outdated dependency. This may not be the problem you're having, but it will help with many similar problems.
Edits: then, my email stopped working again.
A lot of bots have an irregular internet client. FreeBSD isn't well known, so maybe it gets caught in the filter with that.