Reply to "Hide my email" does not work
I always get an error "Cannot send message using the server iCloud" when replying to emails received with an hide my email address. I tried to use mail on my MacBook, Mail on my iPhone and always get the same result. If I try to use the web interface of iCloud I can sent a response, but it will not get delivered, instead I get a "Undelivered Mail Returned to Sender" email from "Mail Delivery System <postmaster@icloud.com>"
MacBook Pro 16″, macOS 12.0