<system.net>
<mailSettings>
<smtp>
<!--<network host="relayServerHostname" port="portNumber" userName="username" password="password" />-->
<network host="relayServerHostname" port="25" userName="username" password="password" />
</smtp>
</mailSettings>
</system.net>
<mailSettings>
<smtp>
<!--<network host="relayServerHostname" port="portNumber" userName="username" password="password" />-->
<network host="relayServerHostname" port="25" userName="username" password="password" />
</smtp>
</mailSettings>
</system.net>