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1. Open Outlook for Mac.

2. Select View > Sidebar.

Sidebar to see your list of folders">

1. In the sidebar, choose the Sent folder.

2. Select Organize > Arrange By > To.

Arrange By > and selecting from the list of options">

Error code 3253 means that your connection to the email server failed or was dropped. You might need to update your version of Outlook.

1. In Outlook, click Help > Check For Updates.

2. If an update is found, download and install it.

3. Restart Outlook.

4. If the problem continues, click Help > Contact Support.

You might be offline. On the Tools tab, make sure the Online/Offline toggle switch is set to ON.

If the problem continues, your message might have an attachment that's too large to send. See Email doesn't send.

Offline/Online slider on the Tools tab

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​​​​​​​What version of Outlook do I have?

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