A newly disclosed privacy vulnerability in Apple’s Hide My Email feature can reportedly allow an attacker to uncover the real email address behind a generated alias. According to the researcher who found the bug, it was responsibly disclosed to Apple more than a year ago but remains unpatched, and independent testing has verified the issue.
I don’t use if with my own domain so I can’t speak for success with that. I’ve used them for a long time for my occasional alias needs, before they renamed from anonaddy iirc.