6. The method according to claim 1 , wherein when the email recipient replies to the email, the method further comprising: using the email sender's international multilingual email address as reply email's receiving email address by an email server at the receiving terminal that supports emails of international multilingual mailbox.
7. The method according to claim 6 , further comprising: generating the email according to RFC6532 protocol, by the email server at the sending terminal that supports emails of international multilingual mailbox; and sending the email in accordance with RFC6531 protocol, to the email server at the receiving terminal that supports emails of international multilingual mailbox.