527084 Security experts for VPS hosting

we have a VPS hosting and from our hosting there are lot of spams going out and we need to avoid all spamming that is done by trojans or virus. i want some one who is expert in this and avoid any such issues and update my server accordingly so no spamming will go out from our server. I need Experienced guys who can do this fast. In my server almost i have 150+ domains hosted. Contact me for more details, please be specific in your questions so i can answer them and finalize the programmer. All the BEST. Thanks