Question regarding hosting Email outside of plesk for domain hosted inside of plesk

[Alphanumeric92]

I have a domain that is hosted on my dedicated windows server running plesk 7.5.6. I recently moved my email over to Webmail.us due to problems with spam etc on that account. However, after pointing my MX records over to webmail.us, all email that is sent from accounts on my dedicated server get lost because it still thinks plesk is hosting the email.

What changes do I need to make to solve this problem?

 

[bob2]

You will need to make sure that you have disabled the mail service for your particular domain if it is not hosted on the same server.