This was quite annoying, as there are many articles written about this, but only one solved it for myself.<\/p>\n\n\n\n
The inboundproxy@contoso.com email address is used by Exchange 2013 as part of the managed availability function. Health mailboxes are set up that ping the Exchange environment for health.<\/p>\n\n\n\n
I found that I was getting undeliverable email bounces from my external mail gateway every 5 minutes (which is the timing of the Managed Availability pings). Which is annoying, as the queue will add up!<\/p>\n\n\n\n
The one article that fixed the issue (thank you very much!)<\/p>\n\n\n\n
http:\/\/apkfedo.blogspot.com\/2017\/07\/exchange-managed-availability-spamming.html<\/a> <\/p>\n\n\n\n Basically my Health mailboxes (which are created automatically) did not have a valid SMTP address of my FQDN of the forest root domain the Exchange environment was residing in. It had an external domain SMTP address, but the root domain was only a SIP address (See ADSI Edit under the proxyaddresses section of each Health Mailbox to verify).<\/p>\n\n\n\n Script in the article to add the valid root FQDN SMTP address to my health mailboxes resolved the issue.<\/p>\n","protected":false},"excerpt":{"rendered":" This was quite annoying, as there are many articles written about this, but only one solved it for myself. The inboundproxy@contoso.com email address is used by Exchange 2013 as part of the managed availability function. Health mailboxes are set up that ping the Exchange environment for health. I found that… Continue reading