MailSender.vshost.exe.config

<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add key="ExchangeUsername" value="johnny" />
    <add key="ExchangePassword" value="foobar" />
    <add key="ExchangeDomain" value="xyz.com" />
    <add key="ExchangeFQDN" value="fqdn" />
  </appSettings>
<startup><supportedRuntime version="v2.0.50727"/></startup></configuration>