The emails you are receiving are almost certainly spam. The contact form on your website has a captcha facility to stop spam programs from sending automatic emails via the form. However this does not stop individuals from completing the form.
Any email address displayed on the internet is open to being found and used by spammers. This is an endemic problem across the internet and affects all
site owners. We have over the past few months increased the security around your email address so it is harder for your address to be crawled but this only reduces the problem and won't remove it completely.
At Reason8 we get in the region of around 1,500 spam emails per day. We manage this by using spam controls both in our email clients (such as Outlook) and proprietary spam filters.
The receipt of spam cannot be stopped, so the best course of action to minimise the effect on your email inbox and business as a whole is to establish a means of control. I would consider increasing any spam filters you use and if it is a real problem consider using additional filters
We hope this is helpful,
Reason8 Support