MX Records Not Loading

[Robert]

I'm having a problem with Bind 8 and it not loading the MX records I
just added.  I have multiple domains and have no problems in the past.
 However I have just added some new MX records and sent a HUP to the
named process but the records did not load.  I can add a new A record
in the same domain and that loads.  I have restarted the named service
but still no luck.  Any ideas would be much appreciated!!!

Thanks,
Robert