Rated 5 out of 5 stars

Excellent add-on, exactly what I was looking for, inserting the e-mail ID in the reply header.
It was affected by the passage to Thunderbird 13, an e-mail to the author (with all required technical information) was answered within less than 12 hours, with a beta release that solved the problem. This is worthy of praise, appreciation and KUDOS,

This review is for a previous version of the add-on (0.8.0). 

new version is nearly ready

Thanks for your kind words!

I have just joined the project last weekend and I have put in a considerable amount of time to fix the problems that Tb13 compatibility has brought. We are currently in the process of finalizing and testing the changes and are hoping to submit a new version for review by the weekend.

Thanks for your patience,
Axel (Developer)