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So, i want to build my own smtp server but i searched a lot and can't find the protocol that it uses or port.

Need help,
Posted

Try http://www.ietf.org/rfc/rfc2821.txt[^] which is a consolidated version of the original protocol definition of RFC821.
 
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Simple Mail Transfer Protocol - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol[^]

Some of what you couldn't find (ports, for instace) is there.

If you don'n mind a suggestion, consider trying to refine your googling abilities.

Pablo.
 
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look at this discussion:
http://stackoverflow.com/questions/1692447/writing-my-own-smtp-server
maybe you will find your answer there
 
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