Rated 4 out of 5 stars

Very useful, great addon. But could Mr Hiroya Matsuba take some development ideas into consideration, please?
Sometimes I have to send an email to many recipients who do not have to see each others email addresses. (It is not a spam. E.g. I have to inform residents of a house about sg, and their emails are in email lists) Of course I should use bcc, but rarely I forget it, and in these cases it is extremely embarrassing. Your addon helps me to think, but perhaps there would be some easy development options?
E.g.: possibility of input some external emails (not domain) / confirmation window only in case of these external emails / confirmation only in case of specific email adresses (list of) / managing exceptions somehow / confirmation if a specific email stands in recipients or cc, instead of bcc? / confirmation or reminder BEFORE sending like "are you sure these recipients are not bcc; have you put a delivery notification; etc?
This would partially or totally solve problems for those, who try to use 'send later' addon. Because this tiny 'later' might be enough to "hide" a recipient or something similar. (other addons do not solve by bcc problem...)
Thank you very much, I hope I can find the perfect solution once:)

This review is for a previous version of the add-on (1.7).