You can now configure Send Later (via its preferences) to schedule all messages which you send with the Send button or Ctrl-Enter to be delayed by a specified number of minutes.
Note that this feature and the "'Send' does 'Send Later'" feature are incompatible so only one of them can be enabled at a time.
The preferences window works in Thunderbird 71+ now.
Some (but perhaps not all) instances of the "Send Later" column showing in folders where it shouldn't have been fixed.
- 源代码在 Mozilla Public License, version 2.0 下发布