My mailbox is not syncing

Likely causes, in order

1. The mailbox needs reconnecting. Your provider ended the connection, often after a password change. Open Settings, Me, My email. If it says Needs reconnecting or shows a red message, press Reconnect and sign in again.
2. The app password changed or was removed. For Gmail and other providers connected with server settings, make a new app password at your provider and reconnect with it.
3. It is still reading your old mail. A new mailbox reads back over time. The card says Reading… or Synced back to a date. New mail still arrives while it reads.
4. It was connected before two-way mail. The card says "Connected before the CRM could change mail." Press Reconnect once, and archive, delete, move, flags and drafts work.
5. You added an alias at your provider. Reconnect so the new address is read.

Good to know

• How far back to read is set under Read back on the same card.
• Admins see every mailbox, and which need reconnecting, under Settings, System, Sending.
• Settings, Tools, Health, Connections, lists any mailbox that stopped working.
• See Connect your email and The Inbox.