MX record

Good Morning All,
Currently our company has a public domain name (ex. mycompany.com) hosted
by our ISP.  There's also an MX record (mycompany.com) created on the ISP
DNS.  We're running our own smtp mail (user@xxxxxxxxxxxxx).  Users can
send/receive their internal/external mails fine. 
I'm planning to set up a new mail system for accounting dept users.  i.e.
user@xxxxxxxxxxxxxxxxxxxxxxxxx  Do I have to call my ISP to create a new
MX record for accounting.mycompany.com so the accounting users can
send/receive internet mails. Can I get away the new MX record. What's my
option? Pleas advise.
Thanks a bunch,
Melvin Chao
chaom@xxxxxxxxxxxxx

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