So a little bit of background.
The domain is controlled by my 1and1 account, which currently points DNS to Dreamhost's name servers.
I setup Google Apps in the Dreamhost panel, creating custom MX records.
I now need to forward the domain to SquareSpace.
Squarespace's instructions for pointing 1and1 domains to them suggests creating an A-Record - http://help.squarespace.com/customer/portal/articles/794484 which then changes the email settings to being controlled by 1and1.
If I change the DNS settings in the 1and1 panel will that overwrite/destroy the existing MX records setup in Dreamhost?
Could I simply copy and paste them from Dreamhost?
Could I use Squarespace's name servers instead of creating an A-Record?
Appreciate any help you can give.
Cheers.
Jolyon