Addresses

Gmail supports plus-addressing of e-mails. Users can send messages to addresses in the format username+extratext@gmail.com, where extratext can be any string, and will arrive in the inbox of username@gmail.com. This allows users to sign up for different services with different aliases and then easily filter all e-mails from those services. In addition, if users receive spam messages directed to an e-mail address with the extra text, they will know what services have leaked out their e-mail address. However, some websites do not accept email addresses containing + , even though the mail-address specification permits use of them.[