Mac Mail - Message Body Not Displayed

I went from 10.8 to 10.11.3 (Elcapitan) and Mail has been totally unreliable. Flaky messages that appear with only headers, or maybe pop up at some point. Hit download and the same messages I deleted after the last download download again. I can see them if I log in to web mail, but that's a pain.

I have rebuilt, deep rebuilt, changed download settings in Mail, nothing seems to work. What a massive disappointment. Apple is now as bad as MS, or worse.

BTW, Safari is slower than it used to be. I'm not seeing as many beach balls as I was, but that may have been due to indexing. This all started on Feb 3, 2016 when I allowed Apple to upgrade me from 10.8 to 10.11.3.

Try quitting all web browser applications and Mac Mail when the problem rears its frustrating head, then just launch web mail and hopefully it should work correctly. Launch web browsers after at your peril.

"Web mail"?? If I go to the two servers my mail is there as usual and displays properly. Getting Mac Mail to display it properly and in a timely fashion is the problem.

Same issues are happening to me. Over the past few months I open and retrieve mail. Can only see the header, no body copy until I quit and re-open Mail several times. Very annoying! Running Yosemite.

This is very weird. On or about the 16th of February, my Mac Book Pro began to act normally. Speed of machine, Safari and Mail were back up to normal.

Mail was operating OK, except for iCloud mail. Contacts and Calendar were behaving.

I really didn't do ANYTHING.

Recounting: I downloaded and installed OS X 10.11.3 Feb 3rd. The program said the install was good and that I might experience of have to restart several times. That did happen. Then the wheels fell off. so Feb. 4 to Feb, 16 was a complete nightmare. Then the ghost in the machine seems to have gone.

I'm wondering if that "automatically detect and maintain account settings" which I turned back on, allows Apple to idle with my Mail program and perhaps something else. Pretty weird. How are things in your town?

And now, after a week of normalcy, BAM the account panel pops up and asks me for a password for my comcast account.

I enter it. It says no. I call coma cast and reset my password and use the new password the next time the account panel pops up and asks for it. Still NO.

I can get my email by accessing the Comcast and BlueHost servers, but iCloud is still a mess. HEY APPLE!!!!!! A little help HERE FOR ALL OF US!!!!!

... asks me for a password for my comcast account.

That is a completely different problem that the one being discussed on this thread, and may actually be caused by comcast.

When your email sender or receiver Server does not respond for ANY reason (including that the server is too busy, crashed, or is doing its Backups) Mac Mail has never been able to tell why. So instead of saying "could not reach one of the servers, possibly due to a server issue, please check with your ISP, or maybe enter a better password," it just asks for the password again.

If you enter anything in the password box it puts up, it clobbers the old password, which can sometime leave you with a wrong password, or sometimes NO password.

If you know the password is correct, dismiss that box and open:

Mail > Window > Connection Doctor

This gives you a detailed look at exactly which server is not working. If you WANT to fiddle with the settings (rather than just wait until later when the Server may be more responsive) you can click on the red light and go directly to the settings for the exact server that is not working properly.

I was facing the same issue. It was being caused by the Trusteer Endpoint. (Confirmed with their tech support.. they are working on a fix)

The workaround is to set the policy associated with screen capturing to "Never". Policies found with in System Prefs>Trusteer>Security Policies

This fixed the blank reply messages in Mac Mail for me. To confirm, i toggled the Screen Cap setting on and off.. and with turning it on, the mac mail glitch reappeared.. turning it to "Never"? You guessed it!!

I think this has worked thanks!

Many here believe the best settings for Trusteer and similar disruptive and useless Anti-Virus software is in the Trash, never to be re-Installed.

Your Mac is already well-protected against random, invisible attacks. You need to stay sharp about the trojan horses that require your complicity to get Installed.

http://www.apple.com/osx/what-is/security/

.

..... sorry, I should have said "unless it's hidden".

Thank you worked a treat after I updated to OSX Sierra

Thank you Linc, worked a treat after updating to MacOS Sierra

Hate to butt in here, but why moving the envelope files in mail do the trick

I would have thought moving .mbox files out would work. If IMAP, these will be re-created.

Since u are displaying messages fine on iPhone and using icould i assume it's IMAP....

I have this issue as of today with my iPhone with ios 10.0.2. Message subject downloads but when you open it the message body is blank.

Thanks

Tommy