I have been using this system for about a year, and it works great. I generally use the pattern yourdomain.com@accounts.mydomain.net. However, I have found from

I have been using this system for about a year, and it works great. I generally use the pattern yourdomain.com@accounts.mydomain.net. However, I have found from time to time that I never get account signup/confirmation emails to these addresses. It seems like they're being silently rejected. Does anyone know if there's some kind of email validation service that might be filtering these? I guess I could use a hash of the domain (eg asdffdsa@accounts.mydomain.net) to make my strategy less visible, but that feels like I'm probably overthinking it.