Hello,
While I'm new to freelancer I have by now a 100% completion rate for all the projects that I worked on. My name is Dragos and I'm a Senior System Administrator with more than seven years of working experience in the web hosting industry, experience that has been gained while working for one of the top web hosting companies from USA - California.
When it comes to the project that I'm bidding on, I will be more than happy to assist you with the investigation of your server. This type of work should involve the followings:
1) locating how the malicious emails are sent (compromised scripts, compromised email passwords)
2) cleaning up all the sources of spam
3) taking additional steps in order to prevent this from happening.
If you have any questions regarding this please let me know.
Thank you,
Dragos