Rated 4 out of 5 stars

The addon works good for us for redirecting (delegating) E-Mails. The accounts are often accessed by several people or by one person from different systems (Linux, Windows).

Since a little while the icon for "E-Mail is redirected" does only appear in the thunderbird-instance from which the E-Mail is redirected.

I defined a tag "redirected" and it works - all systems show the tag.
But it would be better to show the symbol, because one line gets only one color. We use the tags for different purposes. So you have to select the E-Mail to see in the header section all tags.

This review is for a previous version of the add-on (1.40). 

Unfortunately the tag ist the best i can do. Probably you can do some magic with userChrome.css:

tr[data-properties~="Tredirected"] :is(.subject-line img, .Tredirected) {
content: url("resent.svg") !important;
}

Untestet, and you have to provide your own "resent.svg"