EDD Settings:

Gmail view:

Looking at my email logs it looks like it started happening on 7/28/16. Not sure what/if any EDD updates would've been around that time.
I'm also on WP Engine and using Postmark for delivery. Both long before 7/28 as well.
Thanks, we should be able to resolve this easily.
Replicated and confirmed fixed. :+1:
Most helpful comment
Thanks, we should be able to resolve this easily.