What happened to my Mail content after installing El Capitan Security update 10.11.6? I can see the

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El Capitan was asked to update the security update. I did that. Then restarted as asked. All Mailboxes were gone. Got a hint that Mail>preferences>enable this account; first uncheck then recheck again would help. It did. Got the mailboxes back.
But all the message content is missing. I can see only the name and sender, but not content. What can I do?
 

Just_Me_D

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Reboot your computer, let the email account sync to the email server to retrieve the email content. Alternatively, you can delete the email account from the computer and then reconfigure that account on that computer.