I installed a new Exchange Server 2016 in an existing Exchange Server 2010 environment. I am now having trouble to send/receive mails between the Exchange Servers. There is no Firewall between the both Servers, they are in the same LAN.
I am going nuts, do you have any idea why the mailflow does not work?
Please make sure Exchange server authentication is enabled
And make sure your internal FQDN is set properly.
Get-clientAccessServer | fl Name,AutoDiscoverServiceIn
Get-OabVirtualDirectory | fl Server,Name,internalurl,ex
Get-EcpVirtualDirectory | | fl Server,Identity,internalur
Get-OwaVirtualDirectory | fl Server,Identity,internalur
Keep External URLs null in Exchange 2010 and Set the IIS authentication to BASIC + NTLM in Exchange 2010. This is for OutlookAnywhere
Read this for more details.
Use this URL to set URLs
Please restart Transport service after the change.