Andy,
Keep in mind what I am about to say is in no way intended to be critical, merely suggestive to overcome to the technological challenges your location throws up.
With the internet you have a lot of power in what you receive.
Your domain will allow you multiple email addresses. Set up one that is
[email protected].i want to fly for you....or similar.
You can set it that that is only ever downloaded to the office.
You can configure your email client to only check that mailbox when the office is actually closed.
If you really want, you can set your server or email client to automatically bin mails based on subject line.... i.e i want to work for you....or you can nut it down even further that it picks out keywords in the email and rejects on your behalf.
You need an IT guy to develop it for you