Frank Petersen Softwareentwicklung EMail  Request For Comments (RFCs): RFC 821 (Simple Mail Transfer Protocol)  RFC 822 (Internet Mail Header Format)  RFC 1123 (Internet Host Requirements)  RFC 1869 (SMTP Service Extensions)  RFC 1891 (SMTP Delivery Status Notifications)  RFC 1892 (Multipart/Report)  RFC 1893 (Mail System Status Codes)  RFC 1894 (Delivery Status Notifications)  RFC 1985 (SMTP Service Extension for Remote Message Queue Starting)  RFC 2034 (SMTP Service Extension for Returning Enhanced Error Codes)  RFC 2045 (MIME)  Mime Types List RFC 2476 (Message Submission)  RFC 2554 (SMTP Service Extension for Authentication) EMail RFCs Quellen für die Spezifikation von EMails