The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.

You can continue to find trusted guidance and support on the official Apple Support site.

We want to thank the community members who have contributed their time and expertise to help others with their Apple products.

bbbbak Author

Level 1

4 points

All my mailboxes (Web Mail) have vanished and mail does not open on sidebar.

Was editing/deleting mailboxes when all disappeared. Now cannot open mail app.

iMac 21.5″, macOS 10.13

Posted on Sep 3, 2023 9:11 AM

Top-ranking reply

TammyW_03

Community Specialist

Posted on Sep 4, 2023 8:11 AM

Hey bbbbak,

If we understand correctly, after encountering an issue using your email service providers webmail account you're now not able to open the Mail app on your Mac. If that's correct, try holding the Shift key while opening the Mail app to see if clearing the last saved state helps.

If not, what happens when you go back to webmail for the account? If you're still missing those folders, you'll want to reach out to your email service provider to work through that as this could be causing the issue with the Mail app on your Mac.

Let us know how it goes.

Take care!

View in context

All my mailboxes (Web Mail) have vanished and mail does not open on sidebar.

Similar questions