Error message: "No transport provider was available"

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Article ID: 245446 - View products that this article applies to.
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When you use a simple Messaging Application Programming Interface (MAPI) profile, you may receive the following error message:
No transport provider was available


Your profile contains both of the following services:
  • An internet e-mail service such as Simple Mail Transport Protocol (SMTP) or Post Office Protocol 3 (POP3)
  • Microsoft Exchange Server service
This behavior is due to the way that MAPI handles SMTP address resolution. While this configuration may appear to work, the resolution order, and therefore the ability to resolve SMTP addresses correctly, may not work. This behavior becomes more noticeable in complex organizations. This configuration also causes issues when you connect to a computer that is running Microsoft Exchange Server.


To work around this behavior, create two different profiles. One profile is for the Internet mail service, and one profile is for the Exchange Server service.

For more informationabout how to set up Outlook profiles and how to configure Outlook to prompt you for a profile, click the following article number to view the article in the Microsoft Knowledge Base:
195478 Description of user profiles and information services in Outlook 2000 with the Corporate or Workgroup option
182159 OL98: (CW) User Profiles and Information Services
162203 OL97: User Profiles and Information Services
When you set up two different profiles, you must quit Outlook before you can switch to the other profile.

Another way to work around this behavior is to use Outlook Express for POP3 or SMTP internet e-mail services, and to use Outlook when you connect to a computer that is running Exchange Server.

This information applies to using Microsoft Mail in a profile with Exchange and/or Internet Mail Service. In addition, Microsoft recommends that you have a separate profile for the Microsoft Mail service.


If you install Internet Mail Service (IMS) on a computer that is running Exchange Server, mail is automatically sent using Exchange Server. The SMTP server that you specify as your Internet e-mail account is not used.

The Outlook program, acting as the Exchange client software, sends an NspiResolveNames request to Exchange Server. If you install IMS, Exchange Server attempts to handle the message even if you have not correctly configured it to send Internet e-mail. In such a situation, a non-delivery report (NDR) is received.

There is no client resolution available for this situation other than the use of separate user profiles for Outlook. Configure Exchange to send SMTP mail by installing IMS, or to use another e-mail program to send Internet e-mail.


Article ID: 245446 - Last Review: January 25, 2007 - Revision: 3.6
  • Microsoft Exchange Server 5.5 Standard Edition
  • Microsoft Outlook 2000 Standard Edition
  • Microsoft Outlook 98 Standard Edition
  • Microsoft Outlook 97 Standard Edition
kbprb KB245446

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