Found these when I run netstat ... can someone tell me what these are and how I prevent them from using my server.

These domains aren't on my server as far as I know.

tcp 0 0 1server.com:http finalfantasy.main:46531 TIME_WAIT

tcp 0 0 decimal.freeporter:smtp 200-158-161-167.ds:1961 ESTABLISHED
tcp 0 0 decimal.freeporter:pop3 66.153.28.97:2452 TIME_WAIT
tcp 0 0 decimal.freeporter:pop3 66.153.28.97:2964 TIME_WAIT
tcp 0 0 decimal.freeporter:smtp qdm.quickdrawmedi:60910 TIME_WAIT
udp 0 0 decimal.freeport:domain *:* named 1997227523 5814/named
udp 0 0 perfectwebnames.:domain *:* named 1997227521 5814/named
udp 0 0 parked.namesplus:domain *:* named 1997227519 5814/named

Your mail server is being relayed through

How can I stop this

Are you using cPanel

Yes I have WHM and Cpanel access ... one note I have a few clients that host with me but use theor own exchange server for mail ... will stopping this relays affect them also?

Main >> Server Setup >> Tweak Security

As long as your users have a usrname on the server, this should not affect them.

Good luck

This SMTP tweak will prevent users from bypassing the mail server to send mail (This is a common practice used by spammers). It will only allow the MTA (mail transport agent), mailman, and root to connect to remote SMTP servers.

Yes, smtp tweak

those look like reversedns issues.

How so ... please explain and is therer a fix