What is difference between Message-Id and EmailId ?

Tung Tran Van <[email protected]>
Newsgroups gmane.comp.jakarta.james.user
Message-ID <CACy2Njtyc8X1oV0Dya+Ksru_ceHNbCPUHh7yVFRQj8XNsg9Rhw@mail.gmail.com>
Hello all,

I am an amateur. I am confused about the difference between Message-ID *(a
field at header in MimeMessage)* and EmailId*(or MessageId, both have the
same name)*.

I usually use emailId to retrieve messages
*(MessageIdManager.java.getMessage)*, but when I check related MimeMessage
results, I detect that the Message-ID Header has other value.

So, What is the purpose of the Message-ID Header? How is it created?

May somebody help me understand it?

*Thank you,*

*Tung, Tran Van*
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