mail crash direct after opening app on my iMac
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000018
Exception Note: EXC_CORPSE_NOTIFY
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What year model iMac and what macOS is it running?
see > Identify your iMac model - Apple Support
Startup the iMac in Safe Mode and test, then restart normally and test again.
see > How to use safe mode on your Mac - Apple Support
If that doesn't help, download run EtreCheckPro on your iMac.
Then use the following instructions to post back here with the EtreCheckPro report.
How to use the Add Text Feature When Post… - Apple Community