So, I'm using the mail(); function to send comments to my email address. I just made the site live about 4 days ago and yesterday I got what appears to be spam...

Message 1 (Some Russian message about electric treadmills...)
Phone: Technology
E-Mail: robertsl@yandex.ru
Message:

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Message 2
Phone: 123456
E-Mail: ol@aol.com
Message:

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It appears that they are legitimate messages from a visit to my site, but I just don't under stand how they found my site or why they would send it. Is it a person or some automated script doing it? would a captcha stop this?