Knowledge Base

XFOR: cc:Mail User Receives NDR When replying to POP3 Sender

Article ID: 183588

Article Last Modified on 10/28/2006

Microsoft Exchange Server 5.0 Standard Edition
Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q183588

SYMPTOMS

When a cc:Mail user replies to a message sent from an Exchange POP3 user, the cc:Mail user may receive the following non-delivery-report:

   Your message was not delivered to all recipients.
    Subject: <subject>
    Sent:    <Date, Time>

   The message was not delivered to the following recipient(s):
   ,<User name>
   The recipient name is not recognized
   MSEXCH:IMS:<Org>:<Site>:<servername> 0 (000C05A6) Unknown Recipient

A closer examination of the recipient address shows a comma in front of the user name.

CAUSE

The POP3 sender's e-mail Address or reply address (configured in the POP3 client) does not match the Exchange users SMTP address (located in the Exchange Admin <user> properties, E-mail addresses tab, SMTP address type).

RESOLUTION

In the POP3 client, set the "E-Mail Address" or "Reply Address" configuration to the same SMTP address found in the Exchange Admin <user> properties, E-mail addresses tab, SMTP address type.

Keywords: kbprb KB183588