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The SMTP address has no mailbox associated with it error occurs in Microsoft Dynamics 365

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This article provides a solution to an error that occurs when you select Test Connection on an Email Server Profile record in Dynamics 365.

Applies to:   Microsoft Dynamics 365
Original KB number:   3214326

Symptoms

When you select Test Connection on an Email Server Profile record in Dynamics 365, you meet a Test Failed error. The Failure Details section contains the following message:

"The SMTP address has no mailbox associated with it."

Cause

This error can occur if you use the format domain\username for the User Name (Example: contoso\user).

Resolution

Within the Credentials section of the Email Server Profile record, use the UPN format (Example: user@contoso.com) for the User Name instead of domain\username format.

If the User Name is in the UPN format and you still meet this error, verify a mailbox exists for the user and the UPN value in the User Name field matches the email address for the user's mailbox in Exchange.

More information

The following example is the Failure Details that will appear:

Request to Exchange::  
\<Trace Tag="EwsRequestHttpHeaders" Tid="534" Time="\<Date>">  
POST /EWS/Exchange.asmx HTTP/1.1  
Content-Type: text/xml; charset=utf-8  
Accept: text/xml  
User-Agent: ExchangeServicesClient/15.00.1076.004  
Accept-Encoding: gzip,deflate  

</Trace>
<Trace Tag="EwsRequest" Tid="534" Time="\<Date>" Version="15.00.1076.004">
  <?xml version="1.0" encoding="utf-8"?>
  <soap:Envelope xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xmlns:m="https://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="https://schemas.microsoft.com/exchange/services/2006/types" xmlns:soap="https://schemas.xmlsoap.org/soap/envelope/">
    <soap:Header>
      <t:RequestServerVersion Version="Exchange2010" />
      <t:ExchangeImpersonation>
        <t:ConnectingSID>
          <t:SmtpAddress>domain\username</t:SmtpAddress>
        </t:ConnectingSID>
      </t:ExchangeImpersonation>
    </soap:Header>
    <soap:Body>
      <m:FindFolder Traversal="Shallow">
        <m:FolderShape>
          <t:BaseShape>AllProperties</t:BaseShape>
        </m:FolderShape>
        <m:IndexedPageFolderView MaxEntriesReturned="1" Offset="0" BasePoint="Beginning" />
        <m:ParentFolderIds>
          <t:DistinguishedFolderId Id="inbox" />
        </m:ParentFolderIds>
      </m:FindFolder>
    </soap:Body>
  </soap:Envelope>
</Trace>

Response from Exchange:  
\<Trace Tag="EwsResponseHttpHeaders" Tid="534" Time="2016-12-19 19:00:22Z">
HTTP/1.1 500 Internal Server Error  
...

</Trace>
<Trace Tag="EwsResponse" Tid="534" Time="2016-12-19 19:00:22Z" Version="15.00.1076.004">
  <?xml version="1.0" encoding="utf-8"?>
  <s:Envelope xmlns:s="https://schemas.xmlsoap.org/soap/envelope/">
    <s:Body>
      <s:Fault>
        <faultcode xmlns:a="https://schemas.microsoft.com/exchange/services/2006/types">a:ErrorNonExistentMailbox>
        <faultstring xml:lang="en-US">The SMTP address has no mailbox associated with it.</faultstring>
        <detail>
          <e:ResponseCode xmlns:e="https://schemas.microsoft.com/exchange/services/2006/errors">ErrorNonExistentMailbox>
          <e:Message xmlns:e="https://schemas.microsoft.com/exchange/services/2006/errors">The SMTP address has no mailbox associated with it.</e:Message>
          <t:MessageXml xmlns:t="https://schemas.microsoft.com/exchange/services/2006/types">
            <t:Value Name="SmtpAddress">domain\username</t:Value>
          </t:MessageXml>
        </detail>
      </s:Fault>
    </s:Body>
  </s:Envelope>
</Trace>