[Haegin]

What for? Hey where the author got the idea from? The author doesn't use it. Fastmail? The author's method works with any mail service that supports custom domains and email aliases. Seems a stretch to call it an ad when it's not clear what they're promoting.

[amazing_stories]

My first impression was also that this was an ad for Hey. Maybe that's not what the author intended, but it reads that way to me and it's a bad first impression.