Do you know that some providers does not allow different characters than alphanumeric? It's done that way to prevent confusion (and possibly impersonation).
[email protected], where "alias" can be any alphanumeric string (with some limitations I don't know).
Gmail doesn't recognize dots as characters within usernames, you can add or remove the dots from a Gmail address without changing the actual destination address; they'll all go to your inbox, and only yours. [email protected] these addresses belong to the same person. I'm guessing for some reason they took a design decision not to treat dotted addresses differently to avoid emails being routed to the wrong person. if [email protected] getting [email protected]'s emails. Gmail likely supports this use of periods in email address in order to comply with the IETF's email address formatting standards.
With this you can create unique email addresses for certain things and then filter on it or just be able to tell which sites are selling your email address to spammers.
It is a lesson in human nature that so many experts simply recite Google's pat answer on this as if an assertion were identical to an empirical reality.
I am one of the early account holders with the [email protected]
We were able to determine that only a portion of email "leaks" across accounts.
Unfortunately, the fact that I had my account 10 years before they had theirs did not convince them to leave the account to me.As for as I know, there is nothing in the RFCs that disallow this; MDAs are largely allowed to route mail as they see fit, hence the support for aliases, filtering, and forwarding.