Add-ons
Review for Send Later by Ae4105-
Rated 1 out of 5 stars
Doesn't do what it says it does. You need to be online for it to work, which defeats the entire purpose of it and makes it essentially worthless on laptops.
It also isn't very transparent about telling you that you need to be online for it to work. Users coming over from Gmail's send later functionality will be confused, and end up sending mail at the wrong time.
A send later feature should be simple and baked into Thunderbird by default. It is a shame Thunderbird users need to rely on add-ons for core functionality like this.
To create your own collections, you must have a Mozilla Add-ons account.
