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SMTP external relay question - 8.Feb.2012 12:05:14 PM

sebastium

Posts: 1
Joined: 8.Feb.2012
Status: offline

My setup is as follow:

- Exchange 2010 SP1 on an internal subnet (like 192.168.1.1)

- A web server on a DMZ so a different subnet with an application that sends mail (Easymail SMTP express)

There is a possiblity for the application to determine a fixed route, so I want to route all emails to my Exchange box.
It gives me a 550 5.7.1 Unable to relay error.

I created a custom receive connector on my Exchange box with theses parameters:

- DMZ IP of the web server in the network tab for receive
- No authentications elected
- Anonymous users selected
- Get-ReceiveConnector "External Relay" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "Ms-Exch-SMTP-Accept-Any-Recipient" was ran

Still does not work. I even tried a custom connector with Externally secured and Exchange Servers (which should grant more access) and it still doesn't work. What I notice in the log is that the traffic always goes through the Default connector.

What am I missing?

Post #: 1

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RE: SMTP external relay question - 23.Feb.2012 3:33:31 AM

infostellar

Posts: 72
Joined: 10.Jun.2009
Status: offline

It is SMTP protocol error and probably related to eSafe or something else that is deployed in the environment. You may refer to the following Microsoft's helpful article to troubleshoot these relay errors in Microsoft Outlook: http://office.microsoft.com/en-us/outlook-help/troubleshoot-550-553-and-relay-prohibited-errors-HA001112833.aspx

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Regards,

Axel Culver
Exchange Server Recovery | Recover Exchange Database

(in reply to sebastium)

Post #: 2