Append tag to message to email footnote

[FriggGuðrún 5]

I'm trying to get this feature to work properly on my Mac.  Attached is a screenshot of my configuration.

 

In theory, I ought to be able to see a little footer on the end of each email I send and receive saying that the message has been checked.  However, this isn't happening.  I use this feature on my Windows PC, it seems to work great.  I can't seem to get it to work with Mac Mail.

 

Is there something that I'm missing or does this feature not work great on Mac?

 

 

 

 

[planet 232]

My immediate thought is if you're using a secure connection for the Mail accounts? (Email protection in Cyber Security only supports non-SSL connections unfortunately.)