I'm not sure that's really it, chabig. At least it doesn't solve the problem I'm having, which I think might be the same or similar as zombierunner is also having trouble with.
I can reply to an email that has been sent to a hide my email address. I can compose a new email to an address I've sent to before using hide my email.
The trouble comes when trying to compose a new email from a hide my email address I set up when creating a user account for something. I have no email to reply to and I haven't sent one before, so there appears to no way to do it, or I haven't found it at least.
Here's an example of something that just happened. I signed up to xyz.com by creating
hidemyemail@icloud.com. I receive an email from a do not reply address giving me details including an email address for support. How can I compose an email to this address? I have no email to reply to, because it will go to the do not reply address (and it's greyed out and can't be edited). I haven't sent them an email before, so I appear to be stuck (aside from sending them an email from another address, which kind of defeats the object).
Any suggestions?