email not showing on iCloud account on one mac

Chris Courtney-Stones wrote:

My emails that are sent from my iCloud mail account on my Intel MacBook Pro are not appearing on my new MacBook Pro M1 Max mail account. Does anyone have a solution to this please

Verify >System Preferences>AppleID>iCloud> that your iCloud Mail is checked

If it is a sync issue—sign out of iCloud on the M1 Max and back in again.

Sign out of iCloud on your...Mac

Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support

Mail User Guide for Mac - Apple Support