[2019] mac mail had duplicate sent messages
I've discovered that Mac Mail stores a local copy of a message an accounts sent folder by default, but the SMTP server also stores the sent message in the sent folder as well. This results in duplicate send items in my sent folder, which is bad because this will double the amount of disk usage on my Mac and email provider
From googling I found that this problem has existed since at least 2013, and the solution use to be to disable store sent messages. However, in 2019 apple has removed this option from mailbox behavior.
I'm at a lost on how to stop mac mail from storing a copy of messages it sends.
Can anyone provide a solution other than dump mac mail