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12.04.2007 at 07:08AM PST, ID: 23000295
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User cannot send to a particular email address

Asked by matedwards in Simple Mail Transfer Protocol (SMTP), Exchange Email Server, SBS Small Business Server

Tags: failed, setup, verifying

I have an external user (not logged into the domain or LAN) that sends email through my Exchange 2003 mail server. He has a AD user & Exchange account and also a compuserve e-mail account.

When he tries to reply to an email sent to his compuserve account by a customer he gets this NDR:

Content-Type: message/delivery-status

Reporting-MTA: dns;mydomain.office
Received-From-MTA: dns;CAF610
Arrival-Date: Tue, 27 Nov 2007 16:01:27 +0000

Final-Recipient: rfc822;customer@customer.ch
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;550-Callback setup failed while verifying <user@compuserve.com>
550-(result of an earlier callout reused).
550-The initial connection, or a HELO or MAIL FROM:<> command was
550-rejected. Refusing MAIL FROM:<> does not help fight spam, disregards
550-RFC requirements, and stops you from receiving standard bounce
550-messages. This host does not accept mail from domains whose servers
550-refuse bounces.
550 Sender verify failed

Is it my Exchange server not verifying the user as valid to send because of the compuserve account?

Is it the customer's mail server not verifying the user as valid because it expects mail from compuserve?

Should/How do I set up a SMTP connector and does it leave me vulnerable to spam?

Any help would be grealty appreciated

Thanks

Mat

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Keywords: User cannot send to a particular email …
Title
1 Spam mail as NDRs(Non Delivery Rep…
2 Spam fight
3 exchange MTA,  all sent mail is NDR'd
4 Non Delivery
5 NDR Attacks
6 Russian spam and NDRs
 
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[+][-]12.04.2007 at 08:04AM PST, ID: 20403788

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[+][-]12.04.2007 at 08:12AM PST, ID: 20403862

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[+][-]12.04.2007 at 08:24AM PST, ID: 20403968

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About this solution

Zones: Simple Mail Transfer Protocol (SMTP), Exchange Email Server, SBS Small Business Server
Tags: failed, setup, verifying
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Solution Provided By: LeeDerbyshire
Participating Experts: 1
Solution Grade: B
 
 
[+][-]12.04.2007 at 08:27AM PST, ID: 20403988

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[+][-]12.04.2007 at 08:48AM PST, ID: 20404181

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[+][-]12.04.2007 at 08:50AM PST, ID: 20404205

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[+][-]12.04.2007 at 09:02AM PST, ID: 20404344

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[+][-]12.04.2007 at 09:06AM PST, ID: 20404379

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