Inbound mappings for a newly created account are not executed

Having Exchange connector with the following mapping:

<attribute>
  <c:ref>ri:PrimarySmtpAddress</c:ref>
  <inbound>
    <strength>strong</strength>
    <target>
      <c:path>$user/emailAddress</c:path>
    </target>
  </inbound>
</attribute>

When an account is created on Exchange, PrimarySmtpAddress is provided by the Exchange server. However, the user's emailAdress is not set.