I have a problem with my GMAIL accounts and Apple Mail application.
Whenever I open the application, GMAIL accounts do not connect and it is noted “connection error” …
But if I open the account preferences and I check “Calendar” for exemple, it will force the connection and everything is OK. Then I release …
But it’s quite painful …
An idea? Thanks
Simplest way to solve this is to nuke and pave the account:
Quit Mail app
Open system preferences > internet accounts
Select the Gmail account and remove it by clicking the “-“ button
Add the Gmail account back by clicking the “+” button.
For good measure you could check the keychain for any left over Gmail related imap, pop, smtp Keys’s and remove them BEFORE you add the account back again.
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Thank you. I’m trying 
I deleted the gmail account, then I put it back, but nothing changes! By cons I have not checked the Keychain because I do not know where to find them!
Look for any Imap, smtp and perhaps a lone pop key that is related to the effected gmail account.
Okay, but where should I look? In the library ?
Keychain app in Utilities