I would never normally do this, but 1and1 have been experiencing a "glitch" with their system that means you can't add new external domains. It's pretty shocking, to be honest, and unfortunately my client's site needs to go live under their old domain ASAP.
The only solution is to temporarily set up an iframe domain mask... but how best to do this? My attempts don't seem to be working properly (the iframe doesn't fill the screen).
Please help me with this crappy solution until 1and1 get their act together.