ISP isn't blocking 25 and namp shows it open
Code:
root@ks359171:~# nmap 91.121.156.14
Starting Nmap 5.21 ( http://nmap.org ) at 2012-11-16 15:27 EST
Nmap scan report for ks359171.kimsufi.com (91.121.156.14)
Host is up (0.000027s latency).
Not shown: 987 closed ports
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
53/tcp open domain
80/tcp open http
110/tcp open pop3
143/tcp open imap
443/tcp open https
993/tcp open imaps
995/tcp open pop3s
3306/tcp open mysql
8080/tcp open http-proxy
8081/tcp open blackice-icecap
Nmap done: 1 IP address (1 host up) scanned in 0.15 seconds
Just noticed port 25 isn't open in the isp3 firewall, does it need to be? If so which side, tcp or udp?