macOS Mojave – Latest Update and Mail.app Google Accounts Issue

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After updating to macOS Mojave 10.14.4 two days ago and still, I have an issue with taking online Google accounts in Apple Mail.app.

This problem appeared immediately after the update, although it wasn't there before. Also after this update, Apple Mail requested to re-login through Safari and it was simple authentication.

Best Answer

A quick Google search reveals that it's a bug in Mail.app in macOS Mojave 10.14.4 update.

From this post on MacRumors, a popular independent Apple news blog:

Apple earlier this week released macOS Mojave 10.14.4, which has had the unfortunate side effect of rendering the Mail app unusable for some who use Gmail services for their email addresses.

After installing the macOS 10.14.4 update and opening the Mail app, Gmail users are asked to authenticate their email addresses using a Google web login form.

Unfortunately, the authentication process does not stick, and shortly after authenticating, the Mail app asks for authentication once again or refuses to work, listing all Gmail accounts as offline.

Additionally,

Some users have had success setting up their email accounts using IMAP as a workaround. Those who have contacted Apple support have been told that a fix is in the works, so the bug could be addressed in the near future.

Appears that the issue has been acknowledged and the fix is a work in progress.

Some other links worth checking which points to possible resolution:

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