Cannot send an email to one specific address.

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?
OzoneFriendlyAsked:
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manav08Connect With a Mentor Commented:
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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TK-77Commented:
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?

TK
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TK-77Commented:
I should have said can YOU verify the email address he is typing in Outlook. He may be missing something simple...

TK
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vikasjusCommented:
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.
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TK-77Commented:
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

TK
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manav08Commented:
Also try disabling your antivirus software and windows firewall if none of my above recommendations work.
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manav08Commented:
How are you going?? If resolved please assign points or post your follow up questions
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OzoneFriendlyAuthor Commented:
ISP mail server was the problem.
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