Click the Envelope icon in the top bar (go to View > Show Tab Bar if you don’t see it), press Shift + Command + N , or select Mailbox > Get All New Mail .
The built-in is the most effective tool for pinpointing the exact failure point (e.g., wrong password vs. blocked port). Go to Window > Connection Doctor . why won't my mail download on my mac
Full iCloud or Gmail storage stops incoming mail. Check this via Get Account Info on your mailbox folder. Click the Envelope icon in the top bar