Suddenly our customer who uses Exchange Server 2010 cannot send any e-mails to any e-mail address on the www.templegate-electrical.co.uk
I have tried from Outlook Client Software and also Outlook Web Access, but the result is always the same:-
#550 5.1.1 RESOLVER.ADR.RecipNotFound
; not found ##
The e-mail bounces back immediately on the Client PC with a notification of:-
The email address that you entered couldn't be found. Check the address and try resending the message. If the problem continues, please contact your helpdesk
I have flushed the NK2 cache which has had no effect, and rebooted the Server and Client PC. Ensured it is not part of a Spam Block List etc.
However I can e-mail this Domain with no problems at all using sales@templegate-electrica
I have run the Microsoft Remote Connectivity Analyser from the Server using the SMTP Outbound test and all is ok, except the final step which returns:-
Attempting to find the SPF record using a DNS TEXT record query.
The Microsoft Connectivity Analyzer wasn't able to find the SPF record.
No records were found.
Elapsed Time: 125 ms.
Does anyone know what can suddenly have gone wrong?