Emails being sent from Stamps.com even though ShipStaiton emails are disabled.

Hello. Is anyone else having an issue where delivered emails are being sent from Stamps.com even though ShipStaiton emails are disabled for the store connections? This started a couple weeks ago, we have reached out to Stamps and they state to leave the email field blank in ShipStation. But we cant as they are imported from Amazon, Ebay and Walmart with those fields into our system. Now every USPS- Stamps.com postage purchase, customers are being sent those emails. I am assuming the marketplace is blocking them from delivery, but wanted to see if this is possibly just an issue with our account or if others are having the issue as well.