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user_id=602967
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As suggested by another user:
If only a single email is sent for many tasks, over 300 in your example, then perhaps the subject line can be something like:
"Cobian Backup Task Summary, Passed: 300, Failed: 45"

This would be equally useful for those users who only make a single task:
"Cobian Backup Task Summary, Passed: 1, Failed: 0"

You could even add the number of errors to this if desired:
"Cobian Backup Task Summary, Passed: 1, Failed: 0, Errors: 3"