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Where can I find information on SMTP?

I'm looking for information about simple mail transfer protocol supported by image ? can you offer a place to start?
Probably the best place to start looking for information about SMTP is with the RFC 821. http://www.ietf.org/rfc/rfc0821.txt. The standard for image type transfers is MIME (Multipurpose Internet Mail Extensions) a protocol for allowing e-mail messages to contain various types of media (text, audio, video, images, etc.) Among others it's detailed in RFC 2112.
This was last published in June 2003

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