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от dilbar Окт. 17, 2017 ·

If one mail failed (due to wrong email/else) during schedule process that stuck another last all mails in outbox....if anyone facing this issue please reply for solution.

Это отзыв для предыдущей версии этого дополнения (6.3.1). 

от Jonathan Kamens (Разработчик) на Окт. 17, 2017 ·

I agree that this is annoying.

Unfortunately, it's a Thunderbird bug, not a bug in Send Later. I reported it to the maintainers of Thunderbird almost six years ago: https://bug635044.bugzilla.mozilla.org/show_bug.cgi?id=749654 . Unfortunately, they still haven't fixed it.