Q: Mac Mail - Message Body Not Displayed

If the problem goes away if you don't have any web browsers running then it's probably an evil thing called 'Trusteer' that some banks recommend to their customers. Try disabling /  uninstalling it.

C.

I had Trustee which my nephew made me totally remove from the machine as he said it is like a Trojan. However this did not help the message not showing at all :-(.

The problem seems to have gone away – for now!

I do have Trusteer installed on my machine. Dam thing never works properly. If the email issue returns, i'll try removing Trusteer and see if it helps.

I had the same problem, as well, and it turned out to have something to do with the fact that I have Microsoft Outlook for Mac. I couldn't view the body of my emails in Apple Mail. I went to Mail/Preferences/General and where it says "Default email reader: " I changed it from "Microsoft Outlook" to "Mail" and everything worked, the body of my emails began downloading. I hope that helps...

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/

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I've found that this alteration to Trusteer is just part of my problem. I'm using App Tamer on my MacBook Pro and I was having this problem with blank messages, and before I saw this Trusteer solution I'd traced the fault to App Tamer. I found that it was stopping Safari before it could load the message body, and if I stopped App Tamer from running all the message bodies did appear, and this was without changing Trusteer. When I did alter the latter to stop screen capturing the message bodies appeared for a time but I still had to stop App Tamer from running to ensure that they always appeared.

For those of you running App Tamer rather than stopping it running completely you can click the small box next to Safari in the window in App Tamer showing the running applications and then check the box to prevent App Tamer from stopping or slowing Safari when it's hidden.