since yesterday afternoon my Mail.app keeps crashing when I am clicking on my gmail mailbox. I instantly see the beachball and looking into Activity Monitor it tells me that Mail.app uses 100% CPU while (Not Responding).
I tried restarting the Computer, I updated the System, I deleted all Mail-Containers from the Library Folder and also deleted the Envelope index files. None of this helped, still keeps happening.
Other Mailboxes on this system (iMac) work fine. The mailbox causing the problems works in Mail on my iPhone and my MacBook. Hence, I figured it has to have something to do with the iMac in combination with this particular mailbox.
I also checked and repaired file permissions using Disk Utility.
Model Name: iMac Model Identifier: iMac14,2 Processor Name: Intel Core i7 Processor Speed: 3,5 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 8 MB Memory: 32 GB Boot ROM Version: IM142.0118.B11 SMC Version (system): 2.15f7
The crash report (the beginning of it) when Force Quitting the unresponsive application:
Date/Time: 2015-07-07 13:35:31 +0200 OS Version: 10.10.4 (Build 14E46) Architecture: x86_64h Report Version: 21 Command: Mail Path: /Applications/Mail.app/Contents/MacOS/Mail Version: 8.2 (2102) Build Version: 1 Project Name: Mail Source Version: 2102000000000000 Parent: launchd  PID: 2101 Event: hang Duration: 1.00s (process was unresponsive for 263 seconds before sampling) Steps: 11 (100ms sampling interval) Hardware model: iMac14,2 Active cpus: 8 Fan speed: 1199 rpm
I am really out of ideas what to do here. Would be happy for suggestions!
Thank you and kind regards