Some services are DOWN, they matter?

[avispa987]

Hi there.. i had some services off! so I decided to start them and put them in auto start... (I installed ntsysv, yum install ntsysv, and then ran it.. and started the services) But.. i dont know what services are
DNS
POLICYD-WEIGHT
POSTGREY

I had lots of services down.. for example ispcp_daemon (ispcp daemon), vsftpd (i think this service is FTP) and Spamd (SPAMASSASIN). I dont know why they where down, but now they are online, my server is running CENTOS 5.2 with full updates... and i followed the guide in the wiki... if anyone can tellme if those three services are ok to be off i will thank you .

Thanks in advance