Hello --

I have a NameCheap webhost, and I cannot verify my domain name for the life of me.  I am setting the MX record (the only one, in fact) of my domain to:

HOST NAME      MAILSERVER HOST NAME                     MAIL TYPE     MX PREF    TTL
@                     b7c715bbaa6d2348b1205e8d472251      MX               10              1800

But domains.live.com keeps giving me this error:

You need to prove ownership of this domain by creating a DNS record. Use the settings below.

I've made this change over 72 hours ago, have deleted and readded the domain several times.  I hit the refresh button and I keep getting this error back.  I don't know what to do next... any help you can provide would be great.

Thank you!