Over the last couple of days some people may have noticed issues with accessing gmail servers. In most cases people got the message “mail service imap.gmail.com is not responding” when trying to access gmail.
According to Google, these problems are only coming up when you are using the built in email app on mobile devices to read your gmail. Google has posted workarounds which include using the gmail app available from your app provider or by using the webmail feature at gmail.com.
In the meantime, Google engineers are working on fixing the problem.