Don’t Use GrexIt
Email is important to me. If you launch a product around email, you cannot make email worse for me. If you do, no deal.
Like many others out there, I struggle with keeping up with the torrent of email I receive daily, so I gave GrexIt a shot, hoping that it might streamline communication and collaboration right from my gmail inbox, but it did the exact opposite.
A few days after granting GrexIt OAuth privileges, I experienced a noticeable delay in my email’s sending and receiving. What is noticeable? Someone might send me an email at 11:34 AM and I wouldn’t receive it until the next day noticeable.
Suddenly, on the third day, the 503s started happening:

Not correlating the installation of GrexIt and my slow email, I assumed that it was because I had over 20 GB of email, so I did the only natural thing was to archive everything and delete a giant chunk of it. A day later, when that was finished, there was no sign of a speed up. It was time to get Google involved. Here’s what they had to say:
Thank you for your message. I understand that [your account] is experiencing message delays and 503 errors.
I have taken a look at this account’s backend and see that these issues are caused by a combination of incorrectly formatted IMAP requests, as well as a high volume of IMAP requests.
To explain the root cause, in order for IMAP to access your account, it will need to put a lock on your backend database. This lock is put in place to ensure no other service attempts a concurrent write on the same piece of data. The reason this user is seeing message delays is due to the IMAP client holding locks on your account, preventing us from delivering mail.
It appears these IMAP requests are originating from the grexit.com application enabled on the affected account. The date on which the app was enabled also aligns with the date the account began experiencing issues. Unfortunately, as grexit.com is a third party application, it is not supported. To resolve this issue, please disable this app. The affected user may do so by revoking Oauth access from the following link, https://accounts.google.com/b/0/IssuedAuthSubTokens.
If you have any questions, please do not hesitate to ask.
Sincerely, Zack Google Enterprise Support
Conclusion: If you’re looking to streamline your email, don’t use GrexIt
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