Mac Mail App Not Working. It remains empty every time. In order to use messages, you need to have a unique and unregistered mac serial number.
Worked on the first try. If emails aren’t displayed or look strange. If not, are you able to send a mail drop attachment using a different platform, like an ios device?
Maybe, it’s not just your mac but your imessage needs a restart too.
Now, few dayes ago, i have upgraded my both desktop & laptop from windows7 to windows 10 and starts using the inbuilt windows mail app for both computer. Click on “mail” tab from the top menu; To force quit messages app on mac, click on apple menu ( ) and select force quit option from it. Meanwhile gmail showed 7,000 emails… but mac mail app showed 21,000 emails.