what could be the problem

hello my server is giving me lot of trouble these days..
it stops responding to http, mail, ftp, telnet requests after every few hrs then come alive again. where as when i ping to the server its responding so its sounds like its not dead but can move.
what could be the problem.. my machine is running on ensim with redhatlinux 7.3.
when i connect to mail via outlook it says CONNECTED but doesnt move ahead.
last thing i did was installed spamassassin on the machine.

any body have any ideas.

 

 

 

 

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