Single User email: Stopped receiving external email suddenly.

We have an accounts payable account that is solely used for receiving invoices from customers.  The account is not generally logged onto, instead the AP personnel are delegates for that email account and access it from their own outlook.  I received an email from a delegate stating that the account is no longer receiving external emails.  We recently deployed Office 2007, and Symantec Mail Security for Exchange 6.x, but that was about a month before the last external email was received.  Only the one account has reported this problem.  What could have happened, and how can I troubleshoot this?
SPDESAsked:
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augwestDirector of Information TechnologyCommented:
By any chance do you think the mailbox maybe at its limit since you switched? That would cause it to stop getting emails.


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flyingskyCommented:
could it somehow be filtered by your anti-spam?
you can also use message tracking tool to check.
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SPDESAuthor Commented:
The email storage is not even close to it's limit.  I don't think it's filtered because it's only this one account affected.  This is the error message that was sent to my gmail account when trying to verify the users complaint.

Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 #5.1.0 Address rejected ap@mydomain.com (state 14).
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
If you send an email to this mailbox from gmail or hotmail, is it reaching?

Use this account details and run the incoming email  test in the Microsoft test site.
See what that flags and post the errors here for more help.

https://www.testexchangeconnectivity.com/

Rajith.
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SPDESAuthor Commented:
yes, I can send emails internally and externally, I can only receive internally.

Additional Details
  Server returned status code 550 - Mailbox unavailable. The server response was: #5.1.0 Address rejected ap@mydomain.com
Exception Details:
Message: Mailbox unavailable. The server response was: #5.1.0 Address rejected ap@mydomain.com
Type: System.Net.Mail.SmtpFailedRecipientException
Stack Trace:
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()
 
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Do you have any antispam solutions in front of exchange?
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SPDESAuthor Commented:
No
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Is the email address of the account correct in the email address tab? Do double check
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SPDESAuthor Commented:
Yes the email is correct.  It was working fine for a couple of months, and then suddenly stopped receiving outside traffic.  As stated earlier, the account can send and receive internally, and send externally.  If the address was wrong, or if there was an antispam issue, I would think that it would have either never worked(wrong address), or affected multiple users(antispam).
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Any restrictions on the user properties itself? Any delivery restrictions?
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SPDESAuthor Commented:
No different than any other user or than before the issue started.  All restrictions are default settings.  
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Exchange isn't finding the user with that email address and hence rejecting it (provided that you don't have anything else that scans email traffic, like an antispam software). Can you post the email address tab of the user properties and delivery restrictions as well.
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SPDESAuthor Commented:
Well I just noticed that a couple of like accounts are acting the same way.  The only thing I don't understand is that I create these accounts the same way I create all our regular user accounts.  The only difference is that a user doesn't log on to this account on the domain, they just add the inbox to their outlook.  Would this affect it???
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augwestDirector of Information TechnologyCommented:
Is it possible the AD password for these account has expired and isnt letting the email in?
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SPDESAuthor Commented:
I took the affected user accounts and dropped them back into the regular user container.  They were in a No IE container.  The policies somewhere in that container must have been preventing the outside email from coming in (I looked all around and couldn't find it).  After replication, all accounts started receiving outside mail again.  Thank you all for your suggestions.
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