Emails from a particular user keeps bouncing

Hi,

I have a user that is trying to send an email to a user in the company but the emails keeps bouncing with the error:

This message was rejected by the recipient email system. Please check the recipient's email address and try resending this message, or contact the recipient directly. For more tips to resolve this issue see DSN code 5.1.0 in Exchange Online. If the problem continues contact your help desk.

When I carryout message tracking I get the following:

SMTP: Message submitted to Advanced Queuing
SMTP: Started Message Submission to Advanced Queuing
SMTP: Message Submitted to Categorizer
SMTP: Message Categorized and Queued for Routing
SMTP: Non-Delivery Report (NDR) Generated

I can however receive the message if it is sent to the administrator email address.

They have a SBS 2003 setup with Exchange 2003.

They use Sophos Pure message for Anti-spam but have gone through this and cannot see anywhere that this email address could be blocked. I have added it to the safe senders list too.

There are no rules in outlook that could be blocking the either.

Is there anything else that I could check?

Thanks
granite03Asked:
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Andy MInternal Systems ManagerCommented:
What happens if they send an email to another user on the same domain? Does that bounceback at all?

If not (and it's just this one user they can't send to) it may be worth checking Outlook/Webmail's own safe senders/blocked senders lists as the sender's address/domain could be in there (seen it happen many times). I usually prefer to do this in webmail to ensure I'm seeing exactly what the server setup is.

You could also delete all rules for the recipient in Outlook open outlook with a /cleanrules switch in case there's an old/corrupted rule that hasn't deleted correctly causing it.
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Rob ShinwellMessaging SMECommented:
Try sending an email via Telnet from your Exchange server to the recipients mail server. Your should see a rejection message If the recipients mail server is rejecting your email

http://www.wikihow.com/Send-Email-Using-Telnet
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granite03Author Commented:
They can receive our emails, its when they send to us that is the problem.

They can send to the administrator email address and it gets through without any problems but when sending to the user it is intended for it bounces back with the message above.
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Rob ShinwellMessaging SMECommented:
Is this isolated to this one particular recipient. Try asking the 3rd party to send the same email to an alternative recipient to see if they get the same NDR.
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
it sounds like the user is using "cached email address".

I suggest to delete the cache address from this user. Then let this user select the address from global address list.
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