> Even in case (1), isn't it possible that Hide My Email bounces happen differently from regular @icloud.com bounces despite being on the same domain?
I don't think so because when I examine the headers of an HME delivered message to my [email protected] address there's only a single MTA involved.
> We've also been wondering whether Hide My Email was ever responsible for generating the messages with meant-to-be-hidden addresses or whether it was only passing them along and failing to hide them. I don't think we have enough information to tell.
The full headers of the bounce message will tell you.
I don't think so because when I examine the headers of an HME delivered message to my [email protected] address there's only a single MTA involved.
> We've also been wondering whether Hide My Email was ever responsible for generating the messages with meant-to-be-hidden addresses or whether it was only passing them along and failing to hide them. I don't think we have enough information to tell.
The full headers of the bounce message will tell you.