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SMTP error from remote mail server

aldi2
aldi2 asked
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Last Modified: 2012-08-14
Hello, we have a customer that we are not able to send email messages to.  No user can send messages to this specific contact, but I can send from home with no problem.  What is the easiest way to find out if the problem is with my mail server or his. Please see message below.

Mail server: Exchange 2003 SP1 on SBS 2003

This message was created automatically by mail delivery software.  Please do not reply to this message.
Do not use the "Resend" option in your mail client, as this will not resend your original message.
If you wish to resend this message, you will have to compose a new message and send it instead.

A message that you sent could not be delivered to all of its recipients.

The following address(es) failed:

  recipient@hiscompany.com
    SMTP error from remote mail server after RCPT TO:<recipient@hiscompany.com>:
    host hiscompany.com.s8a1.psmtp.com [xx.xx.x.xx]:
    554 No relaying allowed - psmtp
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