Review for Correct Identity by SandRat
Rated 5 out of 5 stars
... If you're using enigmail since drafts are saved encrypted and before you can reopen a draft to send it you have to enter the passphrase.
The other workaround with choosing alternate identity doesn't work at all for me.
This is the best and only addon if you centralize multiple email accounts under Thunderbird. I don't use many and this one is a must. It would be great to get it fixed for 38.0.1 (and beyond).
To create your own collections, you must have a Mozilla Add-ons account.