Need Help Securing Mail

This was in my maillog,and my server was frozen

Sep 24 05:49:06 myserver sendmail[28490]: i8OClru28488: to=<mbrown@goclothing.co.nz>, ctladdr=<user@myserver.com> (509/509), delay=00:00:56, xdelay=00:00:28, mailer=esmtp, pri=30530, relay=mail7.webcontrolcenter.com. [216.119.106.105], dsn=2.0.0, stat=Sent (OK)

Sep 24 05:56:43 server sendmail[1007]: rejecting connections on daemon MTA: load average: 20
Sep 24 05:56:43 server sendmail[1007]: rejecting connections on daemon MTA: load average: 22

Can anyone help me prevent this? All I want is for people to be able to send email to the users at the server, and to have users at the server be able to send and recieve email. No open relay.

 

 

 

 

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