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SBS 2011 / Exchange 2010 : "554.5.1.0 sender denied"

Hi there.

I'm getting a problems with a couple of domains unable to send emails to us. On checking 'Delivery Reports' the messages are being rejected with "This message was rejected by the recipient's email system. Please check the email address.
 '554.5.1.0 sender denied'" messages.

We're running SBS 2011 *without* Forefront.

Where do I go to whitelist these domains?

I tried adding exceptions to the IP Block List Providers (EMC > OrgConf > Hub Transport > AntiSpam but that doesn't seem to have any effect. Anywhere else I ought to look? Perhaps I need to restart a service or two?
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Dale303
Asked:
Dale303
1 Solution
 
Vlastimil SopuchDirectorCommented:
Hi mate,

1) Had the same issue, it turned to be just Outlook doing it.
Check the Junk e-mail options for blocked senders..remove them

2) Also, have you got any UTM/Firewall in your network?
Check the email filtering/spam settings

3) Should you have any AV doing the email filtering, check it too

Cheers
Vlastimil
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David AtkinTechnical DirectorCommented:
Hello,

The exclusions list is for internal addresses to bypass the filtering.  I.E. any emails sent to user@yourdomain.com won't be checked.

You would need to use Exchange shell to add an email address to an IP allow list:
http://technet.microsoft.com/en-us/library/bb124385(v=exchg.141).aspx

Ultimately though, the issue is with the third party being on a block list in the first place, they need to remove themselves from the blocklists.
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Andy MIT Systems ManagerCommented:
The error message given would indicate the emails are been blocked on the user account or server, not a global blocklist so adding exceptions to that will not help.

As per futuretek's response my guess would be Outlook's own junk filtering system (easy enough to check in Outlook or via OWA). If the third party users address is listed in the blocked senders it will cause this behavior.

I assume other external users can email the addresses in question? If not make sure you haven't got "Authenticated users only" turned on in the account's mailbox delivery settings.
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Dale303Author Commented:
Nevermind. Despite protestations of the user, she had blocked them herself...
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