I'm using SBS 2011, which is the combination of Server 2008 R2 and Exchange 2010.
I simulated what would happen if a user would quit the company then come back soon after.
I removed the user's account via the "Small Business Server Standard 2011 Standard Console", I selected not to remove all email or shared documents.
I pulled the users computer off the domain, verified the user was no longer in Active Directory and deleted the users PC.
I tested the users account using (OWA) Outlook Web Access & Gmail to simulate emails inside & outside the company, all tests were fine.
Here is the problem, the next day, when people use Outlook 2010 to send the user an email, the email instantly bounces back, I log into OWA, and can't replicate their errors.
This is what the bounced back email says
Diagnostic information for administrators:
Generating server: ServerName.DomainName.local
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
Original message headers:
I can send direct messages to him via OWA, Gmail, and using my Android (exchange).
I can reply to a message John sends to me in Outlook 2010.
If I (or any user) send a message to John from Outlook it gets returned with the above error message.
I spent about 4 hours looking into this
I removed the users account a second time, this time removing all files and email. The above issue still exists.
Any advice would be very helpfull