No. Your case works for a single person but for more people on a single domain, you would want to do, service1@me.your.domain service1@dad.your.domain (Instea

No. Your case works for a single person but for more people on a single domain, you would want to do, service1@me.your.domain service1@dad.your.domain (Instead of me+service1@your.domain) service2@me.your.domain service2@mom.your.domain and so on. So, those services have no way of fooling you by tampering with the alias parts. But of course this isn't easy unless you roll your own mail server.