Today I received a spam mail and it wasn’t addressed to me, somehow it escaped Google’s mail spam filters and reached my inbox. When I opened to see the mail it wasnt addressed to my mail id instead it was a id very similar to my id just without the ‘.’ dot.
And later learned that Gmail reserves all combinations of the name when we create our account. So if I create an account with email@example.com, it reserves firstname.lastname@example.org and even email@example.com. So any mail addressed to these ids will reach you !!
Original id : firstname.lastname@example.org
Automatically created ids : email@example.com , firstname.lastname@example.org