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6.1 Send (SMTP) Email RFCs

6.1.1 RFC 2821 Simple Mail Transfer Protocol (SMTP)
6.1.10 RFC 2852 Deliver By SMTP Service Extension
6.1.11 RFC 2034 SMTP Service Extension for Returning Enhanced Error Codes
6.1.12 RFC 3463 Enhanced Mail System Status Codes
6.1.13 RFC 3461 SMTP Service Extension for Delivery Status Notifications
6.1.14 RFC 3462 Multipart/Report Content Type for the Reporting of Mail System Administrative Messages
6.1.15 RFC 2554 SMTP Service Extension for Authentication
6.1.16 RFC 2505 Anti-Spam Recommendations for SMTP MTAs
6.1.17 RFC 2442 Batch SMTP Media Type
6.1.18 RFC 1047 Duplicate messages and SMTP
6.1.2 RFC 974 Mail routing and the domain system (MX records)
6.1.3 RFC 1869 SMTP Service Extensions
6.1.4 RFC 1870 SMTP Service Extension for Message Size Declaration
6.1.5 RFC 1652 SMTP Service Extension for 8bit-MIMEtransport
6.1.6 RFC 3030 SMTP Service Extensions for Transmission of Large and Binary MIME Messages
6.1.7 RFC 1846 SMTP 521 Reply Code

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6.1.8 RFC 1985 SMTP Service Extension for Remote Message Queue Starting (ETRN)
6.1.9 RFC 2645 On-Demand Mail Relay (ODMR) SMTP with Dynamic IP Addresses

6.1.7 RFC 1846 SMTP 521 Reply Code Printer Friendly Email This FAQ Discuss

http://www.ietf.org/rfc/rfc1846.txt
This memo defines a new Simple Mail Transfer Protocol (SMTP) [1] reply code, 521, which one may use to indicate that an Internet host does not accept incoming mail.

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