The “+” alias feature rarely works for me when registering for sights. They say invalid. I have used “.” Variations to create multiple accounts on a service.

The “+” alias feature rarely works for me when registering for sights. They say invalid. I have used “.” Variations to create multiple accounts on a service. I wonder what the limit is? Can I do …first.name@ and first……name@ and so on for infinite names! iCloud has auto anonymous emailing with plus, Firefox does to, but tying my services to such a feature rather than even just an email seems fragile.