Rated 4 out of 5 stars

Nice Tool to see if all SMTP connections used to deliver the email have used TLS encrpytion.
I like the option to show all smt hops and their encryption status.

What I would like to have is an option to see a bubble (green, orange, yellow) instead of the smiling face.

This review is for a previous version of the add-on (0.2.5). 

The addon is very small and simple with no configuration options. Adding a settings screen is way more free work than I'd like to put into this software, but if someone happens to develop this feature, I'll be happy to merge it.