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12.12.2007 at 07:15AM PST, ID: 23018415
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550 5.7.1 Unable to relay
Tags: relay, unable, 550
We switched an Exchagne Server 2007. Previously we had user connecting to our old server via pop3/smtp using either outlook express or outlook. User had no problem sending messages.

Now that our users are connecting to Exchage via pop3/smtp they getting the following errors in:
Outlook
Your message did not reach some or all of the intended recipients.
      Subject:  FW: SHAMROCK - Luster Products - Aerosol - PO Confirmation Request 12 12 07
      Sent:     12/12/2007 8:35 AM
The following recipient(s) could not be reached:
      'cberry@XXXXXXX.net' on 12/12/2007 8:36 AM
            550 5.7.1 Unable to relay
      'jeffmangano@XXXXXl.com' on 12/12/2007 8:36 AM
            550 5.7.1 Unable to relay
OR

Outllook Express

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'ALxxx@xxx.com'. Subject 'Fw: ITK functional report: ERROR (itk23 on LPIAPPS2)', Account: 'Luster Mail', Server: '192.168.43.24', Protocol: SMTP, Server Response: '550 5.7.1 Unable to relay', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79

I thought the problem may be that they needed to authenicate to SMTP server was not checked. They are still getting the same error.

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Question Stats
Zone: Software
Question Asked By: jzaino
Solution Provided By: jzaino
Participating Experts: 3
Solution Grade: B
Views: 309
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12.12.2007 at 09:38AM PST, ID: 20458561

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12.12.2007 at 09:49AM PST, ID: 20458653

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12.12.2007 at 10:11AM PST, ID: 20458811

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12.12.2007 at 02:54PM PST, ID: 20460950

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12.13.2007 at 09:43AM PST, ID: 20466015

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12.13.2007 at 11:49AM PST, ID: 20467020

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12.13.2007 at 03:42PM PST, ID: 20468723

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12.14.2007 at 05:46AM PST, ID: 20471432

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12.14.2007 at 07:04AM PST, ID: 20471911

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12.14.2007 at 12:57PM PST, ID: 20474403

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12.21.2007 at 07:03AM PST, ID: 20513923

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12.26.2007 at 06:04PM PST, ID: 20532019

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12.12.2007 at 09:38AM PST, ID: 20458561
I'm not sure if this is your problem exactly - but I had a similar problem with Exchange 2007 and POP3.

Exchange 2007, by default, uses everything secure.  This is what I had to do (in Outlook Express):

Tools - Accounts - Properties (of the Exchange 2007 account).  Go to the Advanced tab and make sure "This Server requires a secure connection (SSL)" is checked for BOTH POP3 and SMTP.

Hope that helps.
Travis
 
12.12.2007 at 09:49AM PST, ID: 20458653
I have tried that and I am still getting the same errors.

Thanks for the suggestion and I will try it again. What do you have set for the authenication for pop3?

Jim Z
 
12.12.2007 at 10:11AM PST, ID: 20458811
I'm not sure what you're asking...  With Outlook Express, I have the username and password.  I did not set Log on using Secure Password Authentication.

Here's the guide I used to set up POP3 - I don't know if there's anything in there that may point you in the right direction or not:
http://msexchangeteam.com/archive/2007/05/16/439093.aspx

Travis
 
12.12.2007 at 02:54PM PST, ID: 20460950

Rank: Savant

How do you control relaying through the server?
The most secure method is authentication, but you need to set authentication credentials for SMTP in Outlook Express specifically - not just the PP3 authentication.

Simon.
 
12.13.2007 at 09:43AM PST, ID: 20466015
All POP3 user can receive their mail with out a problem. It is when a user attempts to send mail outbound(SMTP) that I get the 550 5.7.1 unable to relay. What setting am I missing on the SMTP connector or what ever in Exchane 07?

Thanks fo rthe help & input

Jimz
 
12.13.2007 at 11:49AM PST, ID: 20467020

Rank: Savant

It isn't an Exchange issue - but the client. Have you set the client to authenticate when sending?

Simon.
 
12.13.2007 at 03:42PM PST, ID: 20468723
Yes, the client is set to authenicate!

JImz
 
12.14.2007 at 05:46AM PST, ID: 20471432

Rank: Savant

What authentication options have you enabled or changed on the Receive Connectors for the server?

Simon.
 
12.14.2007 at 07:04AM PST, ID: 20471911
I have a Client connector with the following options checked: Transport Layer Security; Basic Authentication & Offer Basic authentication only after starting TLS; Integrated Windows authentication, Externally Secured.
Default connecter with the following options checked: Transport Layer Security; Basic Authentication & Offer Basic authentication only after starting TLS; Exchange Server Authentication; Integrated Windows authentication.
I needed to create a third because we were getting outside email from our provider; I called it Internert with the following options checked: Transport Layer Security; Basic Authentication & Offer Basic authentication only after starting TLS.

Jimz
 
12.14.2007 at 12:57PM PST, ID: 20474403

Rank: Savant

What ports are those listening on?
By default the "Default" is listening on port 25 and the Client is listening on 587 (TLS).

Furthermore with those options enabled, you will only get authenticated relaying if you are using TLS. That needs to be enabled in the client and the client needs to accept the certificate. Are you using home grown or a purchased SSL certificate? If it is a purchased SSL certificate then the name you use for the SMTP server needs to be the same name as on the certificate.

Simon.
 
12.21.2007 at 07:03AM PST, ID: 20513923
POP3 clients and an application server cannot send SMTP e-mail via Exchange 2007 to external recipients: 550 5.7.1 unable to relay

SYMPTOMS:

An additional receive connector was created, however, the remote IP range is the same as the default connector and it only allows Anonymous users to submit e-mail. We deleted this connector and verified Anonymous is allowed on the default receive connector.  We checked the OE client configuration and it's not using Secure Password Authentication or "My server requires authentication". We checked both of these boxes and the client can now send e-mail. We then checked the application server that's also having problems sending outbound e-mail via Exchange 2007. The application is configured to send credentials, however, it is still not working.

We created a new receive connector just for this application server and another server to relay e-mail. We set the permission groups to "Exchange servers" and set Authentication to "Externally secured". Now the application server can send e-mail to the Internet, as well.

RESOLUTION:

The receive connector configuration and Outlook Express client configuration was corrected and outbound e-mail can now be sent from OE clients and the application server.
Accepted Solution
 
12.26.2007 at 06:04PM PST, ID: 20532019
A request has been made in Community Support to close this question:
http://www.experts-exchange.com/Q_23028103.html

If there are no objections, a moderator will finalize this question in approximately 4 days as follows:
PAQ with refund using {http:#a20513923}

Please leave any recommendations here.

Computer101
EE Admin
 
 
12.30.2007 at 04:55AM PST, ID: 20550646
Closed, 500 points refunded.
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20080236-EE-VQP-29 / EE_QW_2_20070628