Steve on 18 May, 2017 08:12 PM
welcome to the GPGTools support platform. Sorry you are having problems using GPG Suite.
Could you send yourself a test mail and while working on the draft observe if the problem is reproducible. Also it would be interesting to learn, if indeed several messages are sent. Or could it be that "only" the drafts are piling up, while in the end a single message is sent?
Steve on 21 Jun, 2017 03:17 PM
The problem at hand is caused by a bug in Apples Mail.app. It already exists in Apples bug tracking system and is bug #7053869. We first reported this problem with multiple drafts to Apple back in 2013 as bug #15368837. That bug was set to dupe of #7053869, so the issue must have been know earlier.
Please use their feedback form to inform Apple about this problem and ask them kindly to consider investing the time to fix this long-standing Mail.app bug. It may help to add the bug number, so they know which issue you are referring to.