Hi,
I have fallen into this thread after seing that in the recent days I can not update mail from my gmail account configured as IMAP. gmail does not even ask for the password.
I must be a bit dumb, but, I do not see in this thread a path to follow to reach the solution...
Does any one have an "answer for dummies"?

The problem is:
- open n900 mail
- update accounts
- gmail does nothing since 2016-06-22

Cheers!