What causes my Mail app to quit unexpectedly ?
What causes my Mail app to quit unexpecredly on my MacBook Pro ?
MacBook Pro 13″, OS X 10.11
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The cause is usually a malformed email message.
Press and hold a Shift key while launching the Mail app again. That will launch the Mail app with no message selected. In that manner you may be able to identify the problematic message, and delete it.