Mail transmitting and receiving method, mail receiving and sending system

The invention is applicable to the field of electronic mails and provides a method for sending and receiving the mails, and a mail receiving and sending system. The mail sending method includes the following steps: hand-held equipment sends the mail to be sent and the relevant information of the mail to a relay server accessed to the Internet; the relay server accessed to the Internet transmits the mail to a mail server according to the relevant information of the mail. The mail receiving method includes the following steps: the hand-held equipment logs on the mail server by the relay server accessed to the Internet; the mail server detects whether unread mail exists; if so, the mail server transmits the detected unread mail and the relevant information of the unread mail to the relay server accessed to the Internet; the relay server accessed to the Internet transmits the unread mail to the corresponding hand-held equipment according to the relevant information of the unread mail. Therefore, the hand-held equipment can realize the rapid sending and receiving of the mail at one time.