Our district's monthly newsletter recently had a few changes made to it, but primarily visually, and then all of a sudden after sending the first visually updated one, it was bounced (blocked) specifically by 81% of our recipients (about 1700 people). It appeared that all these recipients have a Gmail account.   I was added as a new account admin so I thought it had to do with me switching the email it was sent from, but I re-sent the email using the original send email and they still bounced. I attempted to get into contact with customer support over the phone but was on hold for around 45 minutes before I needed to hang up to focus on other tasks.    Any assistance would be incredibly helpful. 81% of our email database is a lot of people to suddenly be blocked.  ... View more