If you're keeping emails in your email client or web-client like Gmail you can easily find all the emails from the people who did contact you by the subject and this will give you a list of people who used the contact form.
I don't think we will integrate emails storage in Imagevue.
Oh, I guess you are asking about link share email? We will add an option so Imagevue will send an email to you also when somebody is sharing the link so you can keep track of what's going on on your server. What do you think?