I moved my mail server to Windows Live Domains for 2 of my domains. Having experienced issues transferring my emails, I moved only back to my old POP3 server and kept that but the new one on Windows Live. 

Now I cant send emails between the two domains as I get error 550 no such user exists.

I have removed the domain I am not using from my Windows Live Domains Admin Panel to no avail.

Any suggestions?

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