"On My Mac" mailboxes auto appear for Google/Gmail

This issue seems to only happen for Google accounts on MacOS Sierra, essentially "On My Mac" folders are auto creating themselves.


To replicate my setup:


1) Add an iCloud mail account.

2) Add a Google/Gmail account. Confirm in the Mailbox Behaviors section that Sent mail is assigned to [Gmail]/Sent Mail on the IMAP server.

3) Send an e-mail from the Google account.

4) You should now have a Sent->On My Mac folder and the sent message will be located in both the "On My Mac" folder as well as the IMAP Sent folder for Gmail.


I have completely reset the Mail.app, removed all accounts, cleared the entire ~/Library/Mail/V4 folder and the issue continues to happen.


macOS Sierra

Version 10.12 Beta (16A239j)

MacBook Pro (Retina, 15-Iinch, Mid 2014)

Processor: 2.2 GHz Intel Core i7

Memory: 16 GB 1600 MHz DDR3

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Arlo Gilbert
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I am experiencing the same issue. All Sent mail through Gmail is stored in the On My Mac folder. I have also tried completely removing the account and re-adding it but it does not resolve the issue. I've made a point of manually moving everything in the Sent On My Mac folder every day or so until there is a fix.

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rthomps
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