E-mail server settings and credentials has to be set seperatly in the purechat.config.

Why not use the basic mailSettings in the web.config of the web site ?

Ex.:

<system.net>
        <!--Mail settings -->
        <mailSettings>
            <!--
            <smtp deliveryMethod="Network">
                <network host="localhost" port="25" defaultCredentials="true"/>
            </smtp>
            -->
            <smtp deliveryMethod="SpecifiedPickupDirectory">
                <specifiedPickupDirectory pickupDirectoryLocation="C:\Inetpub\mailroot\Drop\" />
            </smtp>
        </mailSettings>
    </system.net>

That way there is only one place to maintain these settings, and you have more features, like specifiedPickupDirectory for testing purposes. 

That's not a bad idea...although it may be possible (however unlikely) that someone would want to use different settings for PureChat versus the other web application. We may add support for this as an option in a future version though.

Thanks!