Plusnet mail and domains registered elsewhere

[#1]

Hi
I notice that Plusnet have a secure webmail interface (main reason I chose the e-mail host that I did)
Now I was wondering whether I could use my domain with my mail by changing the domain's NS and MX records to point to PN's nameservers and MX hosts and asking that appropriate entries be made on these servers while leaving my domain with the registrar?

[#2]

Yes you can.
Ask your registering agent to change the nameservers to:
NS1.FORCE9.NET, and
NS2.FORCE9.NET
You then need to raise a ticket and ask that we create the zone file to bring your domain in for *hosting only*
Once DNS has propogated your mail and http traffic will be pointing to your Plusnet mailboxes and Homepages webspace.

[#3]

Thanks Bob
I'll look again at this once my hosting account with my current provider is due for renewal as I can make the NS changes myself  and then request the changes on plusnet's NS servers (obviously I need to do this first and then make the changes on the registrar to ensure mail is not dropped)
I'm assuming I can use a .com yes? (i notice that you only register domains in the .uk namespace)
Many thanks for your reply.