Exchange server is sending NDR's to inboundproxy@contoso.com so I was troubleshooting this issue and found out that probe definition is using wrong domain name to send probe e-mails to health mailboxes.

<ExtensionAttributes><WorkContext><SmtpServer>127.0.0.1</SmtpServer><Port>25</Port><HeloD
                              omain>InboundProxyProbe</HeloDomain><MailFrom Username="inboundproxy@contoso.com"
                              /><MailTo Select="All"
                              Username="HealthMailboxXXXXXXXXXX@something.something.com" /><Data
                              AddAttributions="false">X-Exchange-Probe-Drop-Message:FrontEnd-CAT-250
                              Subject:Inbound proxy probe</Data><ExpectedConnectionLostPoint>None</ExpectedConnectionLo
                              stPoint></WorkContext></ExtensionAttributes>

So in my case extension attribute uses wrong recipient/username Username="HealthMailboxXXXXXXXXXX@something.something.com"

This had to do with some domain changes we had in the past.
So I could create global override but as we have like 10 mailboxes I would have to create global override 10 times.
I could also add additional smtp address for every health mailbox but I do not want to do that as maybe I will have to recreate those mailboxes again.

Name                                                            ItemType
----                                                            --------
OnPremisesInboundProxy_10                                          Probe
OnPremisesInboundProxy_9                                           Probe
OnPremisesInboundProxy_8                                           Probe
OnPremisesInboundProxy_7                                           Probe
OnPremisesInboundProxy_6                                           Probe
OnPremisesInboundProxy_5                                           Probe
OnPremisesInboundProxy_4                                           Probe
OnPremisesInboundProxy_3                                           Probe
OnPremisesInboundProxy_2                                           Probe
OnPremisesInboundProxy                                             Probe

Is there a way to recreate the probe definitions as I am hoping that after re-creation of the probes the correct e-mail with correct domain would be generated?

If possible, how to do that?

• Edited by D. Omerovi Friday, June 26, 2015 9:49 AM

From my understanding of the probes, the messages are sent to internal HealthMailboxes. It is possible that these mailboxes simply have the wrong email address on them, if so, then check out this blog article by Brian Reid:

http://blog.c7solutions.com/2013/06/queues-building-to-inboundproxycom.html

The cmdlets he refers to at the end can be found here - https://technet.microsoft.com/en-us/library/aa996869%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396.