I have inherited an Exchange 2010 Hosted system which is hosted in an external DC offshore. The hardware & software belong to my client.
As part of the hosting service, the hosting company have been providing an email gateway to filter out spam etc. but they are decomissiing it and have asked us to use another service.
My client has another system hosted with them (Domino) that uses Googles Pstini service for the email gateway role.
The client wants me to setup the Exchange system to use Postini. That part I'm familiar with and I have created the Email Config and User List in Postini. I have setup the ‘Inbound Server’ to be the external IP of the hosted Exchange 2010 server.
The MX records are in place for the test domain and when I do the MX Record test in Postini, that passes.
When I run the SMTP Message Test the results are: Connecting to electronicvirtualoffice.com
220 Postini ESMTP 106 y680_pstn_c6 ready. CA Business and Professions Code Section 17538.45 forbids use of this system for unsolicited electronic mail advertisements.
250 Postini says hello back
451 Can't connect to testdomainname.com - psmtp
221 Catch you later
It is as thought Postini is not able to deliver messages to the Exchange side of things. I can send email out from this system but when replying, the reply never arrives. No NDR so the email is sitting somewhere.
Is there anything I need to change in Exchange and if so how (I mean, what power shell commands do I use in the EMC?)