TLS email encryption

Hello. I apologize for my ignorance on the topic, but I have a MIAB fresh install on Ubuntu 22.04 up and running. Everything seems to be working ok using external DNS (Cloudflare). Status Checks are OK aside from DNSSEC (not enabled on Cloudflare).

I’ve double-checked the DNS records under external DNS, and they’ve all been added. Certificates are all good using Let’s Encrypt.

However, when I test sending emails to my personal Gmail I noticed the encryption shows the red padlock for no encryption.

I’m wondering if anyone has any clues why this is and where I need to look to fix it?

Appreciate any help!

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No ready solution, but sometimes clicking on or near the padlock gives additional info.

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