Review for Check and Send by AThunderbirdUser
Rated 2 out of 5 stars
The functionality provided here is essential (and so should be built into Thunderbird).
There is a bug whereby the confirmation window disappears if one moves away from it - and then the compose window loses functionality.
I have reported this bug and even - in one of several follow ups - offered to pay for it being fixed. I first reported the bug a month or two ago, I think. Response? None.
To create your own collections, you must have a Mozilla Add-ons account.