[BlueOnyx:07528] MX record preference numbers

[User Ernie]

When you create a MX record with "Mail Highest" prioroty, it assigns a
preference of 20 to the MX record. I have run into an absurd situation where a
client is using a large well known mail filtering company, and can't get
support from their helpdesk because the MX prefvernce is set to 20 not 10 as
per their instructions!

Is there some way to set the MX records preference to 10?

- Ernie.