How to write simple mail server in java? [closed]

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I want to write a mail server, but I don't know how. Would you please give me some direction where to search for exmaples?

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Essential reading for implementors of SMTP servers:

• RFC 821 (and updates, most recent is RFC 5321)
• RFC 822 (and updates, most recent is RFC 5322)

The Wikipedia article Simple Mail Transfer Protocol has a huge amount of additional information and links.

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Apache has done that for you. Visit Apache James home page: http://james.apache.org/