This is one of the reasons I switched to a different provider using a custom domain. I can make new addresses in any format I want. There's zero risk of a spammer stripping them down to a base address for the primary account. They also don't get rejected by broken validators.
What’s your plan for when you no longer own your custom domain (think bus factor)? Someone else register your domain and now has access to all your accounts.
yep, i use fastmail with a custom domain. i have a catch all email set up, so i just register any account on sitename.com as "sitename@mydomain" and it all gets sorted into a catch all folder. I can then run rules if i want it to go into a certain category like "bills" or just straight to the garbage.
Not sure about normalizing recipients' emails but some are definitely aware of it because I've seen spam that asked to "reply back to defi.n.it.ely.not.shady+email@gmail.com" or something.
