after 10.10.4 update, can't take Google mail online

Select the Advanced tab in the settings for the account and uncheck the box marked

Automatically detect and maintain account settings

Close the preferences window and save the change.

Actually, mine is just the opposite. I have to check the box to Automatically detect and maintain account settings in order for it to go online.

That was a typo. I did mean check the box.

Sadly, whether that box is checked or not for me, I still cannot make it work. I have tried checking the box and unchecking the box. I have reconfirmed with my ISP that my POP server settings are valid and still no luck. Everything was fine in 10.10.3. Please help. As a plan B option, if it is possible to revert to 10.10.3 please let me know how to perform that downgrade. Many thanks.

Doesn't help me either. Tried checking, unchecking, restarting computer, nothing works.

Go to the gmail website. Click on your account name at the upper right side and select Account. Go to the Sign In & Security preference. Look to see if you have any alerts from sign in attempts. You may have to acknowledge sign in attempts for your devices.

Glenn..where would you see the sign in attempt alerts? I am in Sign In & Security but don't see any alerts? When I see app passwords it shows that I created a brand new password yesterday but it hasn't been used yet

Click on Sign In & Security to open it up. Either select it as a whole, or select the Device Activity.

I checked this. It seems OS X has full access, and there are no security alerts.

It was just another possibility. This was happening to me last week on several occasions where my account was blocked from unknown sign in attempts. I had to acknowledge the attempts from unknown devices so it would go online.

If the suggestions given here and other places you may have checked don't work, you might have to delete the account completely, then re add it back in. If you have trouble adding it back, use other Account instead of Google Account.

When adding an account in Mail or Internet Accounts, after filling in the first window, hold the Option Key down when you hit continue to enable you to select the type of account you want. Have your information ready such as server name, port numbers, etc.

Glenn Leblanc wrote:

It was just another possibility. This was happening to me last week on several occasions where my account was blocked from unknown sign in attempts. I had to acknowledge the attempts from unknown devices so it would go online.

If the suggestions given here and other places you may have checked don't work, you might have to delete the account completely, then re add it back in. If you have trouble adding it back, use other Account instead of Google Account.

When adding an account in Mail or Internet Accounts, after filling in the first window, hold the Option Key down when you hit continue to enable you to select the type of account you want. Have your information ready such as server name, port numbers, etc.

I assume this would mean mail would have to re-download all messages again? I have 60,000 messages, perhaps 10Gb, so I would like to avoid that if at all possible.

If you are using POP, then yes it would. So you might want to look for other answers.

No, I'm using IMAP.

Are you sure you are not over your limit? You might check at the gmail site to see exactly what you have.

Technically, messages in IMAP accounts are stored on the server, although it does copy to the mac for offline viewing. POP would download the messages to the computer fully.

You might try verifying your KeyChain to make sure you have no problems with it. Maybe delete the KeyChain passwords for the gmail account. Verify your settings are correct.

Not much else you can do, or I should say I don't have anything more to offer in solutions.