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Exchange not forwarding mails for external domains. 554: Sender address rejected: Access denied

I have an Exchange-server, where I have setup mails for some accounts to forward to an external address (xx@instantemail.t-mobile.de). The option "Deliver messages to both forwarding address and mailbox" is set. The reason for forwarding to this external address is that the users are then able to get a copy of their mails on their Blackberry.

This setup has been working perfectly until recently. My current problem is this:
All internal mails (sent from a domain on the exchange-server) are correctly delivered to both the internal and the external mailbox.
All mails sent from an external domain are successfully delivered to the mailbox on the exchange-server, but are not forwarded to xx@instantemail.t-mobile.de.

The users get NDRs like the following:
"There was a SMTP communication problem with the recipient's email server.
<mylocalserver #5.5.0 smtp;554 <the_sender>: Sender address rejected: Access denied>"

I have found the mail in Exchange, where I can see the following information (this mail was sent to 2 local users):
SMTP: Message Submitted to Advanced Queing
SMTP: Started Message Submission to Advanced Queue
SMTP: Message Submitted to Categorizer
SMTP: Message Categorized and Queued for Routing
SMTP: Message Categorized and Queued for Routing
SMTP: Message Queued for Local Delivery
SMTP: Started Outbound Transfer of Message
SMTP: Message Routed and Queued for Remote Delivery
SMTP: Message Delivered Locally to multiple recipients
SMTP Store Driver: Message Delivered Locally to Store to user@mydomain.xx
SMTP: Non-Delivered Report (NDR) Generated
SMTP Store Driver: Message Delivered Locally to Store to user@mydomain.xx

I have a provider in front of my mail-server, who scans for virusses and spam. They have a web-interface, where I can see the complete flow of mails. The forwarded mail does not show up there, which makes me think, that the mail never leaves my exchange-server.

To summarize: Why are mails from external domains not forwarded as they should?
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HenrikDK
Asked:
HenrikDK
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1 Solution
 
rakeshmiglaniCommented:
how are the global settings configured?
was this forwarding working fine before?
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kieran_bCommented:
>><mylocalserver #5.5.0 smtp;554 <the_sender>: Sender address rejected: Access denied>"

Show us that line with "better" obfuscation

By which I mean something like this (make it as accurate as you can)

<<<myserver.mydomain.com or mydomain.com or mydomain.local>>> #5.5.0 smtp;554 <<email address? Username? IP address?>>: Sender address rejected: Access denied>"
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HenrikDKAuthor Commented:
rakeshmiglani:
By global settings, what are you specifically thinking about? As far as I know, this server is running pretty much as default. By looking in "Message Delivery properties", not much is enabled (no sender filtering, connection filtering or recipient filtering. Block messages with an SCL >7, no action. If Sender-ID fails, accept)
Yes, this forwarding has been running smoothly for a long time, and only stopped working a couple of days ago.

kieran_b:
Sure, I'll try to write that line in further detail (the first part is translated from Danish, but the 554 SMTP-error is originally in English):
      xx@instantemail.T-Mobile.de on 18-06-2008 13:15
            There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
            <master.MyDomain.local #5.5.0 smtp;554 <email-address (xx@xx.de)>: Sender address rejected: Access denied>

Thank you for helping me with this issue, I appreciate it. Please let me know if any additional information is needed.
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rakeshmiglaniCommented:
i was looking for the enabled options under the advanced tab in internet message formats
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HenrikDKAuthor Commented:
rakeshmiglani:

In "Internet Message Formats" I have only 1 row:
Name: Default, Domain: *

In the advanced tab, the following options are enabled:
Allow delivery reports
Preserve sender's display name on message.
The following options are disabled:
Allow out of office responses
Allow automatic replies
Allow automatic forward
Allow non-delivery reports

NDRs were disabled yesterday, since users were thinking their mails didn't reach the recipient.
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rakeshmiglaniCommented:
was the "Allow automatic forward" disabled recently or has it been that way since long?
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HenrikDKAuthor Commented:
I was thinking that too, and I have asked another admin, who has access to the server, if he has changed the setting. I am still awaiting his reply.

I can try enabling it, but if I understand correctly, it only affects client-side forwarding (http://exchangepedia.com/blog/2008/02/how-to-forward-mail-to-external-email.html)
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HenrikDKAuthor Commented:
The update on this case is as follows:

Our external provider, who scans both outgoing and incoming mails for spam/viruses, recently disabled relaying for unknown domains.
Since we were using their server as smart-host, it rejected mails from all external domains. The solution for now has been to stop using them as a smart-host.
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larsagenCommented:
I have the same problem, i removed the smarthost( virus112). Then it works fine 2 weeks. Then it starts again. We use virus112 for spam an virus filtering.
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larsagenCommented:
I have still the problem. After we stop using smarthost it only worked for 14 days. So I need to get a solution. Maybe HenriDK have the same experience.
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