Need "from" address to be a static one, not sender's

My host has recently implemented SMTP relay policies that break this form… anyone filling it out and listing an email address not hosted with them gets blocked silently (I only found out by looking at the admin panel log) because the form uses their addresses as the “from” address.

You’d think that by setting a default “from” address in the settings panel, it would result in the behavior I’m looking for, but it doesn’t.

Can someone help me locate the right toggle for this? I need the emails to all come “from” a set address.

While we’re at it, can we set a “reply-to” address? Anyone know where/how I could hack that?

Thanks in advance!

http://wordpress.org/extend/plugins/custom-contact-forms/