hi, i am redhat certified and cisco certified, have more 5+ experience with webhosting (cpanel/plesk/webmin/ispconfig). i hv done many server hardening services, patching kernel, penetration test, concurrent user testing and implement firewall, i can tuning your sql performance, web server performance.
also, i have done many mail server installation ( postfix/exim/qmail + antivirus + policyd + dovecot + sieve + quota + webmail + policyd + mail stat ) , please see my previous works on elance.
we can arrange to chat on skype for further discussion, my skype id : avudz99. thanks.
best,
M