Hello,
My name is Alex. I have more them 5 years experience in administering linux servers. I'm currently employed by on of the largest SSL Certification Authorities as a Senior Linux Systems Administrator. I manage a server farm of more that 300 servers.
We use Gentoo as the operating system and qmail for the MTA, so I know my way around this very well. I can take care of your issue without problems.
I will require root level ssh access and access to your DNS panel if not hosted on the same server.
Thank you for your time and I hope you will consider working with me on this project. Please let me know if you have any questions.
Best wishes,
Alex