@mimmo thanks for clarification... so what happened when you have an email with a dot during the identification??? Only one person can receive the message???!! What the point the advantage to have an email with dots???
@Lieux the alias allows one person to manage multiple accounts using the same address. I use name+mom and firstname.lastname@example.org so that they do not need to be bothered with it.
What the point the advantage to have an email with dots???
@Lieux the point that may not have been terribly clear in the responses to this post so far is that every account must have a unique email address assigned to it. Using the gmail tricks that @mimmo mentioned means that you can effectively create more than 1 unique email address that end up in the same single Gmail account. More here: http://www.thewindowsclub.com/gmail-address-tricks