If you have a crash Mail Archiver might show you the below window:
Mail Archiver records some data what it has been doing. This is written into "Session Log" files in the Application Support Folder. The files are deleted after 30 days. These files are sent with the Error Report feedback automatically.
You can view the session logs when you select the menu item Help ->View Session Logs:
If you can't send an email for some reason you can get to the session logs in Finder with the menu item Help -> View Session Logs in Finder.