Hi,
We are a hosting exchange provider company. We recently migrated a company from rackspace to our hosted Exchange. All users are successfully migrated and are sending and receiving emails.
The issue is that external users have autocomplete email addresses of rackspace's users in their outlook. Now that users are migrated to our exchanage, if someone tries to send an email using autocomplete address from outlook then email bounced back.
I also tried to send an email using autocomplete and email bounced. Bounced email shows rackspace's server name in the rejection message.
Is there any permanent solution to this issue? I have read about X500, but we migrated 5000 users. How can we create x500 for 5000 users?
Any help will be highly appreciated.
Regards,
Anees