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Application stopped forwarding e-mails to gmail on two devices

Application stopped working after a few days. This is occurring on two monitored devices. When I check the settings for the e-mail settings, I am receiving the following:

Unable to send test email to ****@gmail.com. Check your internet connection or the Gmail password/username specified.

Please see attached screenshot: http://i.imgur.com/CqCKmZC.png.

I've reached out to their support e-mail address, through their Facebook and have yet to receive a response regarding this and several other inquiries.