HT204173: Use Mail Connection Doctor
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Helpful answers
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Oct 12, 2015 9:04 PM in response to khrhnhby Linc Davis,There are reports that this issue is caused by a bug. The following workarounds seem to have helped in some cases. Try them and see whether there's an improvement.
1. Hold down the shift key while launching Mail, or the option key while quitting.
2. Leave the Mail preferences window open when quitting.
3. Eliminate all subfolders of mailboxes in IMAP and Exchange accounts. You may have to access the accounts in a web browser to do this; e.g., for an iCloud Mail account, you would sign in to icloud.com.