Exchange 2010 relay error

[Jobos]

I'm having problems configuring relaying on Exchange 2010.

 

Right, I've got an intranet page written in asp .net that sends an email to a group of addresses stored in an access database. The problems start when the page tries to send emails outside of the domain, sending emails internally work fine.

 

The error message is:

Server Error in '/' Application

Mailbox unavailable. The server response was: 5.7.1 Unable to relay

 

In EMC I've made a receive connector and set the network tab to receive mail from the local machine IP as per instructions here Allow a Server to Relay Email in Exchange 2007 and 2010 | Techieshelp.com |IT Problems (funny enough this page is now blocked when it was working fine this morning). Using telnet I can send an email using SMTP commands so I can't see what the problem is

[techieshelp]

Hi Jobos,

 

I saw this , which is scarily my website so registered so I could help, if you are relaying externally then try adding anonymous aswell as exchanger servers to the connector

 

thanks

 

Allen

[tarquel]

Have you checked on that Recieve Connector the Authentication and Permission Groups tab?

 

What do you have there?

 

Have you tried only selecting Externally Secured under Authentication (or possibly Intergrated Windows Authentication) and under Permission Groups, try ticking Anonymous as a test:

 

EDIT: Beat me to it by one minute Techieshelp

[techieshelp]

lol, only becasue your forum notified my website. I agree though, anonymous settings will resolve this.

Have you checked on that Recieve Connector the Authentication and Permission Groups tab?

 

What do you have there?

 

Have you tried only selecting Externally Secured under Authentication (or possibly Intergrated Windows Authentication) and under Permission Groups, try ticking Anonymous as a test:

 

EDIT: Beat me to it by one minute Techieshelp

[Jobos]

I don't know what's wrong with this, it seems like I've tried every combination of setting. So on Authentication tab I only have Externally Secured checked and the Permission tab has Anonymous Users checked and Exchange Servers checked.

[tarquel]

I suppose it also depends on what the site itself is doing....

 

How about ticking Exchange Users on the last tab.

[sukh]

Hi

 

Can you configure the custom connector that you have created to so that under "Permissions Groups" Tab you have "Exchange Servers" selected only and on the "Authntication" Tab you have "Externally Secured" and "Transport Layer Security (TLS)".

 

Then can you restart the MS Exchange Transport service and test.

 

Sukh

[Jobos]

Hi

 

Then can you restart the MS Exchange Transport service and test.

 

Sukh

 

Wait a minute... do you mean I have to restart the Exchange Transport service after each change of the connector? I've not been doing that!

[sukh]

Hi

 

Not after every change. If you configure as above and then restart the Exchange Transport Service and test, if it fails, we can look into further.

 

Sukh

[Jobos]

Ok, I think the additional connector is a red herring as I've removed it and restarted the Exchange Transport connector and I still get the same error.

 

So now I have a client connector listening on port 587 with permission group Exchange Users and the ISP connector listening on port 25 with permission groups set to anonymous users.

 

The access database contains 2 email addresses, my school address and my home address.

 

Here's the code and to recap I only get the error when sending to an external address:

 

Protected Sub SendButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles SendButton.Click

       

       'Create a connection string
       Dim connString As String
       connString = "PROVIDER=Microsoft.ACE.OLEDB.12.0;DATA SOURCE=C:\Inetpub\Newsletter\Newsletter-test.mdb;"


       'Open a connection
       Dim objConnection As OleDbConnection
       objConnection = New OleDbConnection(connString)
       objConnection.Open()

       'Specify the SQL string
       Dim strSQL As String = "SELECT Name, Email_Address FROM tblMembers"

       'Create a command object
       Dim objCommand As OleDbCommand
       objCommand = New OleDbCommand(strSQL, objConnection)

       'Get a datareader
       Dim objDataReader As OleDbDataReader
       objDataReader = objCommand.ExecuteReader(CommandBehavior.CloseConnection)

       Dim i As Integer
       Dim sName As String
       
       Dim mailServerName As String = "gc"
       Dim too As String
       Dim from As String = "[email protected]"
       Dim subj As String = "Latest newsletter"
       Dim body As String
       Dim sendcount As Integer = 0

       
       While objDataReader.Read
           For i = 0 To (objDataReader.FieldCount - 1) Step 2
               sName = objDataReader.GetValue(i)
               too = objDataReader.GetValue(i + 1)

               body = "Insert message here"
              

               Dim message As MailMessage = New MailMessage(from, too, subj, body)
               Dim mailClient As SmtpClient = New SmtpClient

 mailClient.DeliveryMethod = SmtpDeliveryMethod.Network

               message.IsBodyHtml = False

               mailClient.Host = mailServerName
               mailClient.Send(message)
               message.Dispose()
               sendcount += 1

           Next

       End While

       'Close the datareader/db connection
       objDataReader.Close()
       ProgressLabel.Text = "Finished sending. Sent to " & Convert.ToString(sendcount) & " recipients"

       

   End Sub

[sukh]

Hi

 

On your client connector can you set the "Permission Group" tab to "Anonymous users" and "Exchange servers".

 

And the "Authentication" tab to "TLS" & "Basic Authentication" & "Offer Basic AUthentication only after starting TLS" & "Exchange Server authentication"

 

The ISP connector, I assume this is your send connector?

 

Sukh

Edited March 23, 2011 by sukh

[Jobos]

The ISP connector, I assume this is your send connector?

 

Sukh

 

No, it's the receive connector.

 

The point I was trying to make above is that I don't need to change the connector settings because the intranet page can send email to internal users so that proves it's talking to Exchange ok.

[sukh]

Hi

 

Can you run and post/pm the following.

 

Get-ReceiveConnector |fl >c:\Receive.txt and Get-ReceiveConnector | Get-ADPermission |fl >c:\permisson.txt.

 

Sukh

[Jobos]

Hi

 

Can you run and post/pm the following.

 

Get-ReceiveConnector |fl >c:\Receive.txt and Get-ReceiveConnector | Get-ADPermission |fl >c:\permisson.txt.

 

Sukh

 

OK but I'm not back there till next week so I'll do it then.

 

 

Thanks.