I used to use this trick, but got sick of fighting the bulk spam sent to admin@, postmaster@, etc. the filters got most of it, but damn it was annoying whenever they changed tactics and a small flood would sneak by before being identified by the filters and further spam prevented.

That's why I moved from maintaining my own mail server (with spam filter and activate sync) to a provider. I still own the domain and have a catch-all configured for per-account mail addresses on a subdomain with the mail going to bulk folder on my primary IMAP. The subdomain also prevents the dumbfire admin@... spam.

Only spam I get is on leaked addresses.

Instead of using <service>@, sign-up with <service><secret>@ and forward only the messages that match *<secret>@