Inbox is a famous free mailbox website, ranking fifth in the world. The single email attachment is limited to 20M (the client can support 50M attachment). The site not only has the common e-mail function, but also can provide free network hard disk service.

Gmail (Google Mail) is Google's free email service, released in 2004 by way of invitation to sign up, once launched to provide 1GB of storage space, far beyond the then mainstream Yahoo Mail, etc., in 2007 began to fully open registration.