Cannot send email to external recipient

Mail protocols
Microsoft Exchange 2003
Microsoft Outlook
Hi all, I'm having problems with a particular user trying to send to an external contact. The external contact has sent an email to my user but when the user tries to reply or send a new mail to this external email address, he receives a mail delivery failure. I can email the external address with no problems. He can email other accounts in that mail domain - it is just this one he has problems with. Anyone any idea why?? Error as follows: The message could not be delivered because the recipient's destination email system is unknown or invalid. Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient. Thanks JB

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  • Petroleumman
    Hello, I know this may sound like a pretty simplistic answer, but has your user checked to make sure he/she has the recipient's address correctly listed in his/her contacts? I've seen many times where a user will set up a contact and fat finger the address or simply exclude a character making the address invalid thus returning your stated error. Good luck!
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  • Stevesz
    Are you using the exact same address for this person as the user is using? I.E. are you replying to the same message as theuser would, or are you sending a message based on the address the user has given you? The problem could be, if the latter, that the user is giving you an address in the form of recipient@domain.tld, while the return on th ee-mail is recipient@servername.domain.tld. If you do an MX lookup on th eformer, you'll find an MX record, on the latter, there will be no MX record. If you are both using the exact same address, then, we would do a bit better with the exact SMTP error number that is given in the error message to determine what may be going on. It is possible that the user may be blacklisted in an anti-spam filter at the user's site, which would be why you can send the message but the user cannot. Steve//
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