Exchange 2010 sending problem

Our company was hosting 2 email domains on our exchange server. For example * and *  The company split up and now the people who use domain B have their own office and their own server. That is working fine however people at the original company domain a cannot email people at domain b at the new location they get. The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk. On the original server I removed the domain accounts, the address from the default domain policy but I don't know what else to do. How can I get it so users at domain A can email people at domain B. its like something on the server is still seeing the address.
Axis52401Security AnalystAsked:
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guswebbConnect With a Mentor Commented:
Have you also removed the entry in Exchange that defines server A as an authoritative server for domain B? If not, your mail server will be trying to route emails intended for domain B internally but then finding that no addresses exist (since you removed them).
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