Email sending

My client is two weeks away from launching a donation campaign and, naturally, the "donations" page's money tab which is an iframe containing the money form is not sending email. It is a dual-purpose page: one to enter data into the dB, which works fine, the other is to send an email notice which has suddenly stopped working. This form has been working fine for over a year but for some reason, emails have stopped. The strange thing is that the other two forms do send their emails, but they are not tied into any databases. I'm attaching the affected pages, one which is the DWCS6-generated form and the other which contains the iframe that displays the form. Would you give this your eagle eye and see why the form enters data but does not send email? I'm at my wits end trying to find the cause. I need this resolved before they launch their campaign, of course.

Any help, as always, is greatly appreciated. BTW, been hearing really good things about you and WebAssist on the PineGrow forum... seems I'm not the only one who uses DW to generate dB-related code and then imports into PineGrow.