- Make sure you have a Send Connector in O365 so that I route all emails from your subdomain e.g. imanage.domain.com back to the Public IP where your Communication Server is , use the Router to NAT port 25 from this IP to the communication server and make sure SMTP is allowed through the local firewall
- Update the ‘Email Domain’ on the ‘WorkSite Server’ properties to ‘imanage.domain.com’ stop and start the ‘WorkSite Server’ service.
- Then update the ‘Domain’ in the communication server ‘Exchange Online’ properties to ‘imanage.domain.com’ stop and start the ‘Exchange Online’ service.
- The above will allow internal recipients to Send and File , if wanting external recipients to be able to file emails to this server, make sure you create an MX Record for imanage.domain.com externally to route to your communications server ( preferably via your Spam Filter)
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