A website I'm working on needs to have a form for any visitor to submit a request for information about a service. The user will not need to create an account, and contact details are just part of the form. The user can also enter a free form message. This information is to be forwarded to someone non-technical who will contact them about buying services. (So yes, this is pretty much marketing stuff.)
A point of clarification: this app is being built as contract work, so we have pretty much no control over the e-mail systems of the people who would receive these requests.