Mail opening blank pages on start

Building on a previous posting above

There could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.

If the issue is present in the dummy account - then, this appears to be a System Wide issue on the computer.

Download the Application Etrecheck directly from the Developer.

The Application is Not a " Silver Bullet "  and is  only a tool to examine the Hardware / Software used on this computer 

This is a Diagnostic Tool that makes no changes to the computer Hardware / Software used on this computer 

The application is free or paid from added features. 

The Report will Not Reveal Any Personal Information. 

Post back the Full Report - copy and paste - >>>> using the Additional Text Icon ( 3rd Icon to last ) <<<

bensrose wrote:

There was no post with a solution here. I used the Apple support chat and was encouraged to check each of my mail folders to see if any were loading. I had a too large file in my Outbox. Once I removed it and restarted Mail, the issue disappeared. It was clearly linked to the Outbox in this case.

Very recently, on another similar thread, the cause was things stuck in the Outbox. With yours, the size sounds like it was the problem. But on the other thread, there didn't seem to be a reason why they ended up in the Outbox.

There was no post with a solution here. I used the Apple support chat and was encouraged to check each of my mail folders to see if any were loading. I had a too large file in my Outbox. Once I removed it and restarted Mail, the issue disappeared. It was clearly linked to the Outbox in this case.

Try quitting Mail. If it won't close use Force Quit by clicking the Apple icon in the upper left and choose Force Quit.

Then.......start Mail again but press and hold Shift key while launching it. Then test to see if this helped.

Try starting the Mac in Safe Mode and see if Mail works correctly in Safe Mode.

Something is opening a New Message window that is stuck waiting for something.

If it works in Safe Mode, then there is a third-party System Modification causing the problem.

Is the Mail Application using " Column View " ?

Does this issue occur when responding to an E-mail ?

Does of occur when composing a New E-mail ?

I have tried using Column View to respond to an e-mail and a smaller Window appears

I have tried using Column View to to compose a New E-mail

In Both Cases I am Not Using Full Screen Mode in Mail

No issues closing the Blank E-Mail windows using the Red Button

Perhaps the Issue on your machine is using Mail in Full Screen Mode ?

I had tried to send the email and it seemed to have gone, but I didn't check the outbox and I didn't get a message saying it was stuck. Then the recipient told me she hadn't received it, so I made the pdf size smaller and it went with no problem. It never occurred to me to check the outbox until the Apple rep mentioned it this morning. It did seem to be the size of the attachment, and I haven't had a problem since I deleted it.

It was about 40mb - I did get a popup asking if I wanted to transmit another way or try emailing. I opted to try emailing. When it didn't go, I reduced the size of the pdf and the second send with no problem. The first send was stuck in the outbox.

Same for me. Did you find a solution? 🤔