Rated 4 out of 5 stars
I highly recommend this add-on as it allows the user to control intended recipient(s) of their emails. However I'd like it might be even more secure with the following feature:
It should notify you when you send a message without any info both in To, Cc, and Bcc fields – in other words when you have omitted to specify any intended recipient of your message. Thunderbird still send your message but to an undisclosed recipient which of course does not exist.
Dear Hiroya Matsuba, could you please consider adding this feature which is badly required? Many thanks in advance.