How can I make Fastmail notifications on Android not show my e-mail address?

Currently, if I receive an e-mail notification, I get the sender and my e-mail address, and have to go into the notification to read the subject and text.

I know the Fastmail app is sending my e-mail address as a notification category due to how it handles multiple accounts, but is there a way to have Garmin Connect (I assume that's where the problem is) ignore that category tag, and show just the sender and subject in the initial notification view?