I noticed some other threads where folks are having issues getting forms to send through on Windows servers. We just built a site for a client that needed to run on Windows and the forms are not sending.
I don't have direct access to the server to see what the mailer is logging, but noticed in another thread, thus plugin was recommended to help the cause: WP Mail SMTP http://wordpress.org/extend/plugins/wp-mail-smtp/
That plugin hasn't been updated in a while - can anyone recommend one still active? Thanks!