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Cannot send an email to one specific address.

Medium Priority
Last Modified: 2012-08-13
I have a client who cannot send email to ONE specific address. When he tries, Outlook 2007 says;

Your message did not reach some or all of the intended recipients.
      Subject:  XXXXXXXXXXXXX
      Sent:     11/02/2009 9:19 AM
The following recipient(s) cannot be reached:
      xxxxxx xxxxxx on 11/02/2009 9:19 AM
            None of your e-mail accounts could send to this recipient.

He emails plenty of other people just fine, and I can email the address in question as can plenty of other people.

His ISP assures him their mail server is not to blame.

Anyone have any guru ideas on what I can check to find out why this is happening?
Watch Question

Is he 100% sure that he has the right email address (I have to ask). Has he tried emailing this individual from another email account as a test?


I should have said can YOU verify the email address he is typing in Outlook. He may be missing something simple...


It might be possible that intended receipents has receive mail restrictions at his/her end.
Second possibility is receipents mail server ip address is black listed.
Assuming it is a POP3 or IMAP account, I would be trying to use another POP3 MAIL SERVER for testing.
If it works, it will point out to the problem at the ISP end.
If it doesn't - The other thing I can suggest is to create a new profile in OUTLOOK 2007 and try from that profile.
Also make sure that your computer is fully up to date with all MICROSFT patches installed as well. Go here - http://update.microsoft.com/microsoftupdate/v6/default.aspx?ln=en-US

Let me know how you go.

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Is there more to that message in the return email? If not, what does the email header read?
- Right Click Message - Click Message Options - copy/paste header


Also try disabling your antivirus software and windows firewall if none of my above recommendations work.

How are you going?? If resolved please assign points or post your follow up questions


ISP mail server was the problem.
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