Whenever I receive a notification from mail, I hear the notification sound but the banner shows up 3-5 seconds later. There is a delay between the notification sound and notification banner. This problem is only specific to mail app. How can I fix it? I have tried restarting and some other standard/quick fixes but nothing helped. This issue also came up after I updated to High Sierra. I would appreciate any help!

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    I've also been seeing this since upgrading to High Sierra. It's happening on three computers, even after a clean install. – farski Feb 4 '18 at 13:27
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    I've tried updating to the latest version, quitting and restarting the app and the computer and everything else I could possibly imagine, but nothing seems to work. It seems to that the bug is in the source code of the app rather than something with the system. I also posted this problem on a few other platforms but didn't receive a reply yet! – Abby Feb 5 '18 at 14:45
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    I'm having this problem on Mojave (10.14.6) even after reinstalling the OS – Morozov Aug 12 '19 at 14:33

Had the same issue on a 2017 27" iMac. Spoke to Apple support....(I have APPLE CARE)

They had me do 3 things:

  1. Upgrade to the latest version of macOS High Sierra 10.13.4 (That alone did not fix it).

  2. Reset the SMC (for my desktop machine, they had me shut down and unplug the machine for 15 seconds instead).

  3. Reset the NVRAM.

  • that is really weird. i would have thought this was a software bug that could be easily fixed but I actually got another mail client so I don't apple mail anymore. – Abby Apr 4 '18 at 19:47
  • that being would following these steps be useful just as a regular maintenance of the machine? because there are times when I get some random bugs here and there which bog my mind – Abby Apr 4 '18 at 19:53
  • Resetting NVRAM did the job for me! – Pei Apr 12 '19 at 5:20
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    Could someone actually explain why resetting NVRAM fixes this problem? After all, Mail is, I suppose, a normal application that can issue notifications. What NVRAM has to do with it? – Loreno Jul 27 '19 at 15:25

I was plagued with this issue too since upgrading to High Sierra, here's how I fixed it:

  • Close the Mail app;
  • Go to Settings - Notifications - Mail;
  • Select "None" for the alert type;
  • Untick ALL of the other options for Mail notifications;
  • Close Settings;
  • Open Mail and hit send and receive;
  • Close Mail;
  • Go back to the notification settings for Mail and restore the previous settings (or whatever you want to use in there);

These steps got me rid of the annoying 5 second delay between the notification sound and the popup showing up, hope it works for you guys as well.

  • thanks for sharing your solution. personally, it was pretty annoying so I just gave up on mail, and downloaded the official outlook app, which works well enough that I can't be bothered to even open mail again. – Abby Mar 2 '18 at 19:45
  • Right, I got to say the issue was back a couple of days later, so this workaround didn't fully fix the problem. – David Mar 18 '18 at 18:08
  • very strange. because I have a few friends who use macbooks, and they didn't seem to have this issue so I am wondering what could be the cause. hopefully Apple takes notice 🤞🏻 – Abby Mar 19 '18 at 19:41

Simply resetting the NVRam solved the problem for me. (I'd add this as a comment to Michael's answer, but I lack the rep.)

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