Why is my IMAP port not showing as open ( yet it works? )

Posted by Leo on Server Fault See other posts from Server Fault or by Leo
Published on 2011-11-26T21:35:26Z Indexed on 2011/11/27 1:53 UTC
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imap

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ports

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nmap

Ive recently setup Postfix and Dovecot IMAP on a Debian Lenny box. Sending to this domain works fine and reading the email via IMAP works fine too. I'm curious though as to why when running nmap, port 10143 is not shown as open.

nmap -sS -O 127.0.0.1

Starting Nmap 4.62 ( http://nmap.org ) at 2011-11-26 21:30 GMT
Interesting ports on localhost.localdomain (127.0.0.1):
Not shown: 1711 closed ports
PORT     STATE SERVICE
22/tcp   open  ssh
25/tcp   open  smtp
80/tcp   open  http
3306/tcp open  mysql

Am I missing something with NMAP?

Thanks

Leo

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