Previous 1 2 Next 15 Replies Latest reply: Jul 31, 2013 5:27 AM by ciendolor
sdpate Level 1 Level 1

The upgrade to Mountain Lion went smoothly but Mail works really badly afterwards.


  • When sending an email, it takes a few minutes before the mail goes out. And that's with any size message.
  • Auto-completion of mail addresses while composing takes multiple minutes. Even after it finally comes up with a list of email addresses, pressing enter on one also takes minutes to acknowledge
  • At various times, hitting the mail icon on the dock has no effect. The same is true with Command+TAB


Overall, the unresponsiveness is painful and making me wish I hadn't upgraded

MacBook Pro, OS X Mountain Lion
  • sdpate Level 1 Level 1

    Btw, I quite Mail and restarted. I also restarted the Mac. No luck with either!

  • HansMestrum Level 1 Level 1

    I have the same problem. Besides this most of the time when my imac is awaken from sleep mail hangs and I see a crash report. I have send it to Apple support several times.

    So my problem with mail is on my imac.

  • 123MAC Level 1 Level 1

    I have a MacBook Pro and a MacPro and both are giving me the same problem with mail after I upgraded to Mountain Lion.


    It take ages for mail to start when I start the program for the first time.  Attacments are not shown in the mail and I am unable to complete a message.   I have to save it as a draft first, the open it again and then the attachents are vissible.  Only then can I reply to the mail.


    This is very bad!  I wish I never did the upgrade :-(


    I really hope that apple will fix this ASAP.

  • space-dementia Level 1 Level 1

    I too experience problems with the Mail app after upgrading to Mountain Lion. My p[roblems are not quite as severe but still annoying enough to make working with Mail a pain:


    I can open Mail as quickly as before but when I select a message or switch between inboxes (icloud and two IMAP accounts) the response is delayed. I can click on messages in my inbox but they won't display for a while. Instead I see the message "No Message Selected" in the preview pane.


    The other problem I have is to get Mail to respond when switching to the app after working in a different app. This does not always happen but frequently enough to stop a productive workflow.


    I am using a MacBook Pro with 4 GB RAM and I have 25% free space on my HDD. I have rebuilt the index for my mailboxes but that did not help either. Does anyone have an idea how to solve this problem?

  • clintonfrombirmingham Level 7 Level 7
    Mac OS X

    Since you're having problems after a ML update, why not take your question over to the Mountain Lion forum?


    You may find other users there experiencing the same problems and there may be some solutions...



  • Werner Goldbach Level 1 Level 1

    This post from another thread solved my problem:



    I was also experiencing lags when switching mailboxes or even when clicking through my mails in the inbox or quitting the app. Not as severe as others described it, but still 0,5 to 1 second - in two words: "not adequate" for an up-to-date MBP. Could be relevant that I deleted both files of the name mentioned (""), one in the /Library/Preferences in the root level and one in /Library/Preferences in my user folder.


    Other than that I did not experience any other issues with the ML update.



  • sdpate Level 1 Level 1

    This didn't solve my problem. First of all:


         $ ls /Library/Preferences/

         ls: /Library/Preferences/ No such file or directory


    but I do have the file in my local Library:


         $ pwd


         $  ls -l *mail*

         lrwxr-xr-x  1 spate  spate     64 Jul 26 11:08 ->      ../../../../../Preferences/

         -rw-------  1 spate  spate   6733 Jul 27 08:24

         -rw-------  1 spate  spate  56130 Jul 27 08:12


    This is after I moved to and then started Mail again. As you can see, it created a new, much smaller


    No luck - just as painfully slow as before!


    This is horribly painful!

  • sdpate Level 1 Level 1

    And just for kicks, I tried rebuilding the Mailbox. No change.

  • sdpate Level 1 Level 1

    I'm not going to add anything else here. If people have comments, fixes etc, please post them to:


  • Petervanh Level 1 Level 1

    I just deleted and restarted mail. Seems to work perfect now. Whereas it was using more than 600 MB (activity monitor) before, it now is only using some 32 MB.

  • Neil2 Level 1 Level 1

    I also have the problem with very slow sending of messages in Mail.  It gives me the spinning beachball for hours.  It started recently for me and I'm still on Lion, 10.7.4 for now.  So, it might not be related to upgrading to Mountain Lion, 10.8.

  • quantxxx Level 1 Level 1

    Where is ?

    I don't have it in Preferences or Application Support

  • sayanbasu Level 1 Level 1



    This solution worked for me:



    Don't forget to restart the mac after using the fix.

    My mail is working seamlessly again.

  • fredfromfrisco Level 1 Level 1

    I called Apple support and they had me run the update for Airport and everything runs great


    Mail had been taking 98% of cpu now .07

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