This was recently kinda misrepresented in the media, in my opinion.

Yes, notifications can leave traces. But it’s traces on the device itself that can be forensically extracted. Though notifications are pushed through Apple’s/Google’s servers, the contents are encrypted end-to-end.

I wish this was available for iOS.

I trust Signal and like it a lot, but I do wish they’d remove the stupid MobileCoin rubbish.

Is the alias on your own domain or a shared one?