Have been setting up coexistence with 2007 as per MS blog on this.

It says to create a new receive connector as per your 2007, but this caused issues during CU9 install so had to manually change the port for this connector to 24 so the install could complete.

I now have the default "Default Frontend *Servername*" connector working and external mail flow working OK but internal users are having issues and the Exchange logs this:

The account 'DOMAIN\NAME$' provided valid credentials, but it does not have submit permissions on SMTP Receive connector 'Default Frontend EX2013'; failing authentication.

I assume because all the other tick boxes as per a normal internal receive connector need to be configured... But when I either change the port of the connector I created which matches the 2007 for internal use (where there is an SBS Internet connector and and internal connector without issue) but it won't let me enable with port 25 or same IP range as interferes (but is enabled BOTH enabled fine on 2007 matching rules) and if I attempt to enable the options that appear required for internal users to use this connector it fails telling me:

If the AuthMechanism attribute on a Receive connector contains the value ExchangeServer, you must set the FQDN parameter on the Receive connector to one of the following values: the FQDN of the transport server "EX20130.internaldomain.local", the NetBIOS name of the transport server "EX2013", or $null.

Which I obviously (assume obviously) can't configure as it's external facing... But documentation in other locations seems to indicate this is the solution...

What do I do?

By the way the log parts above are in italics when I edit the post, but when I hit submit don't show... Don't know how many times I've posted about how garbage this text box is.

• Edited by Allister Wade 2 Thursday, August 13, 2015 6:46 AM

Hi,

For your description, I notice that Receive connector 'Default Frontend EX2013' is used for AnonymousUsers.

Do you add relevant permission for it?
If not, please run below command to add submit permission for the user who has this problem:

Get-ReceiveConnector "Default Frontend EX2013" | Add-ADPermissions -User <the user's identity> -ExtendedRights ms-Exch-SMTP-Submit