POP3 commands

Is there any POP3 commands which is used to get each message's subject?  Or the subject of each message is just determined by checking if the string 'Subject:' exists at the beginning of certain line?  Also, is it the same for Date, From, Reply-To, etc.?
If there are some commands for these, what are they?
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yingkitAuthor Commented:
Edited text of question.
yingkitAuthor Commented:
Adjusted points to 50
yingkitAuthor Commented:
Edited text of question.
POP3's TOP command get whole header, you can check any elements as you need. But I'm not sure how to deal with very long items, for example, 100 recipients in the "To:" field, which may be send in multiple lines. Please refer to POP3 RFC to be sure.

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