Mail is hung up on an outgoing message with very strange symptom. Every time I launch Mail a messageI tried to send keeps flashing on the screen alternating with the Mail window. They flash back and fourth about 2 times a second and nothing works.
Please help, Mail is disabled till I find a fix for this.
Mid 2012 15" MacBook Pro with Sierra OS 16 GB ram, 500 g SSD Recently upgraded from Mavericks
Uninstall each third party running applications from the computer and see this method .
Click on Go on top menu bar , hold option key click on > library > select mail folder > right click on mail folder there itself > click on copy mail > right click on extreme right hand side in column B , that is below persistence info.plist > click on paste item .
Entire mails are copied to V5 folder .
For Mac OS High Sierra - the folder will be V5 , For Mac OS Sierra - the folder will be V4 , For El Capitan - the folder will be V3 , and for OSX Yosemite the folder will be V2 .
Go to the corrupted IMAP account > open system preferences > click on internet accounts > select the account that has to be deleted & click on minus sign .
Configure new IMAP account , go to top menu bar , file > import mail boxes > import data from > select apple mail > click on continue > select the back drop folder then choose new .
When new IMAP account is opened , a new folder with all mails will appear in the mail side bar .You can rename the folder .
Also check in new user account How to test an issue in another user account on your Mac - Apple Support and configure mails Set up Mail with email accounts - Apple Support
tygb,
Do I need to literally uninstall all third party applications, or just be sure they aren't running?
John
Gosh, uninstalling everything sounds to me like more trouble than restoring back to Mavericks, which was working fine before the upgrade.
Mail hung up on an outgoing message - very strange symptom.
