about fake email

Could this be realized?----I send a email instead of another person(say A), let the receiver get a wrong information that it's "A" send it.?
xixiAsked:
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bjorklundCommented:
If I have understood this right, you want to send a mail in another persons name. Is that right?
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xixiAuthor Commented:
yes, that's right!
I want to know could this be realized? I know a person who told me that He Could Do This! Need what kind of tech?
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pc012197Commented:
Of course this *can* be done - but it shouldn't...

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xixiAuthor Commented:
Of course??
BUT I only want to know how? I mean is this kind of tech difficult to handle?
Because the person who told me he could do this is very pround of his tech, so I want to know is this very difficult, and very few people know this?


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Erich050197Commented:
The technique is not hard.  All software is publicly available and so is the how-to info.  See chapter 13 of the book "Core Java", which you should be able to find at

 http://www.prenhall.com
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