Do I need an MX Record?

We have a hosted email provider and have an MX record in our DNS for domain.net. I'm planning on setting up a mail server on FC5 for use by OTRS. It seems to be the simplest way to get mail in and out of the system. Do I need to set another MX record for helpdesk.domain.net? Will I be able to set another MX record? Thanks Joe Fusco Network Manager Ocean Dental Corporate Headquarters Stillwater, OK Email: joe.fusco@oceandental.net Customer Service: The state of voluntary subjection to a customer, the condition of being bound to service. IMPORTANT - This e-mail message is intended only for the use of the individual or entity to which it is addressed, and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you are not the intended recipient, you are hereby notified that we do not consent to any reading, dissemination, distribution or copying of this e-mail message. If you have received this communication in error, please notify the sender immediately by return e-mail, delete this e-mail, delete the transmitted information and destroy any copies. Any dissemination or use of this information by a person other than the intended recipient is unauthorized and may be illegal. Violators may be prosecuted. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late, incomplete, or contain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission.
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Joe Fusco