XCLN: ErrMsg: No Transport Provider was Available for Delivery

• Microsoft Exchange Windows 95 client, versions 4.0 and 5.0
• Microsoft Exchange Windows 3.x client, versions 4.0 and 5.0
• Microsoft Exchange Windows NT client, versions 4.0 and 5.0

SUMMARY

When you send mail using a Microsoft Exchange client, you receive the following error message:

   Your message did not reach some or all of the intended recipients.

      Subject: Subject of the message
      Sent: 7/19/96 11:20:50 AM

   The following recipient(s) could not be reached:

      John Doe on 7/19/96 11:20:52 AM
      No transport provider was available for delivery to this recipient.

CAUSE

This error is generally caused by an invalid recipient address. It can present itself when the address is an unrecognized or unsupported address type.

For example, using the Personal Address Book (PAB) to address mail. Typically, when migrating to Microsoft Exchange, users will tend to use a PAB entry to address mail. In some instances, the address looks like the friendly name that is also in the GAL, but when getting details of the user in the PAB, the address will contain that of the old mail system.

RESOLUTION

Delete the address from the PAB and then add the user back into the PAB from the Global Address Book (GAL).