Mac Mail App Not Working. The finder not responding issue can be very annoying as we are used to relying on the app to access files and folders. They get a notification saying:

Here are the top 3 things to try in order to get the mac mail search function working again in el capitan. Now, select messages option and then click on force quit option from the bottom of the screen. Mail app inbox kept growing;
Maybe, it’s not just your mac but your imessage needs a restart too.
We recommend before proceeding that you install this update first to see if it fixes mail which you can install by going to the mac app store and selecting “updates” at the top. Force reboot your ios device. More specifically, some gmail users have said that after installing the macos 10.14.4, and launching the mail app, some gmail users are asked to authenticate their email addresses. If people don’t receive emails you send.