Why does sent folder contain 2 copies of all messages sent from MacBookPro?

Well, if I do what suggested all my sent emails from that account disappears in the sent folder in Mail.app. Not just one of the duplicates.

It will then also not store the sent mail in the Sent folder in the hotmail web-account.

That is not what I want, I would like to have the mail stored on the web-account as a backup. Then it is not required to take backup of mail of I should reinstall my mac. Just set up the mail again, and it downloads everything.

On solution would be if Mail.app not stored the sent mail locally, but only in the hotmail-account. And only one time. Since both duplicates disappears if I disable the "store on server", it might indicate that Mail.app doesn't keep any of them, but stores two at the hotmail web-account.

Any suggestion?

Hey TaylorP56659,

I understand how duplicate sent emails can irritate you, no worries though! I can assist you with seeing if we can get this sorted out. So if it is only occurring with your Hotmail account, try checking the Hotmail account's Mailbox behaviors in the Mail preferences. It is possible that you have the sent items saving on the server which will allow the Mail app to have it twice. This is because a local copy and the downloaded server copy is in the App. Follow the steps below to disable saving the sent items on the server so that will not happen. You may also want to check the Hotmail settings via webmail.

1. Launch Mail app

2. Select the Mail preferences from the Mail Menu Bar

3. Click the Accounts tab

4. Highlight your Hotmail account

5. Click Mailbox Behaviors

6. Uncheck "Store sent messages on the server"

7. Close the Mail preferences and send a test message

You can see additional Mailbox Behaviors preferences

The steps above should stop those duplicates form popping up in your sent folder in the Mail app. Thanks for using Apple Support Communities

Have a great day.

You might want to consider starting a new discussion. Since this one is marked solved, less people are likely to look at it. A new post would be much more visible. You can link to this one.

Yes, good idea!