Rated 5 out of 5 stars

All previous issues fixed. It's now working great again. Your quick reaction time is really appreciated!
Just one minor point: the %....% option is indeed useful, but quotation marks are not stripped from these headers (e.g., %Reply-to%). I imagine that it will not be a big problem to fix for the next release.
In the meantime, thanks gaby_hy.

This review is for a previous version of the add-on (0.5.1).