what are these ports for?

I just checked my system with nmap, and it returned two open ports that I don't know what they are for...
Port 587: submission
port 2000: callbook
What are they for, should they be open?
LVL 17
psimationAsked:
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interiotConnect With a Mentor Commented:
port 587 seems to be ESMTP, a port probably opened by sendmail.  http://www.armware.dk/RFC/rfc/rfc2476.html  I'd guess it should be open if you think port 25 should be open.

I've no clue what callbook is, but it's perhaps related to ham radios?  Here's a few related pages (search for callbook within them)
    http://www.qrz.com/ftp/library/faq_ham2.txt
    http://www.mit.edu/afs/sipb/project/www/stock-answers/callbook-searching    http://www.qsl.net/hl1kis/callbook.htm
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psimationAuthor Commented:
thanks, seems 2000 is for mysql then...
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