The Post Office Protocol( POP) and the Internet Mail Access Protocol( IMAP) are each a set of rules for delivering e-mail from a server such as sendmail to an e-mail client such as Netscape, elm, or pine.

• 邮局协定(op)和因特网邮件存取协定(MAP)是每个递送电子邮件的一组规则从一服务器如此的当做对一个电子邮件用户端，像是网景、树或松树发送邮件。