RFC821: 简单邮件传输协议(SMTP)
RFC1652:SMTP Service Extension for
8bit-MIMEtransport
RFC1869:SMTP Service Extensions
RFC1870:SMTP Service Extension for Message Size
Declaration
RFC1891:SMTP Service Extension for Delivery
Status Notifications
RFC2554:SMTP Service Extension for
Authentication
RFC2505:Anti-Spam Recommendations for SMTP MTA
RFC822: APRA互联网络文本信息格式协议
RFC1157:简单网络管理协议(SNMP)
RFC1521:MIME信体格式定义
RFC1522:MIME信件头格式定义
RFC1725:邮局协议第三版(POP 3)
RFC2060:Internet Message Access Protocol Version
4(IMAP4)
RFC1893:Enhanced Mail System Status Codes
RFC2251:Lightweight Directory Access Protocol
(v3)
RFC2254:The String Representation of LDAP Search
Filters
