Do I Need a Sub-domain?

Hi there,
My company has a registered Internet domain name for mycompany.com with
correct MX records, and my email system is working well with
user.TakeThisOut@mycompany.com.
Now, I am setting up a mailing list server called mailinglist.mycompany.com,
and I want customers to send emails to subscriber.TakeThisOut@mailinglist.mycompany.com.
Do I need to create a sub-domain called mailinglist.mycompany.com with MX
records for it?
Or, how could I redirect emails subscriber.TakeThisOut@mailinglist.mycompany.com to
server mailinglist.mycompany.com, instead of mailing to my current corporate
email server?
Thanks,
Ross

> Now, I am setting up a mailing list server called
> mailinglist.mycompany.com, and I want customers to send emails to
> subscriber.RemoveThis@mailinglist.mycompany.com. Do I need to create a sub-domain
> called mailinglist.mycompany.com with MX records for it?

Just add this to the mycompany.com zone file:

mailinglist.mycompany.com. IN A <ip address of server>
mailinglist.mycompany.com. IN MX 10 mailinglist.mycompany.com.

Any email addressed '@mailinglist.mycompany.com' will then be sent to the
server called 'mailinglist.mycompany.com' for processing.