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6.1.4 RFC 1870 SMTP Service Extension for Message Size Declaration Printer Friendly   Email This FAQ   Discuss

http://www.ietf.org/rfc/rfc1870.txt
This memo defines an extension to the SMTP service whereby an SMTP client and server may interact to give the server an opportunity to decline to accept a message (perhaps temporarily) based on the client's estimate of the message size.
 

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