Guests contacting admin

Hi guys
i have a problem im a little concerned about , today ive recived a pm on my forum from a guest , it seems all my admin team have recived this message , im a little worried as i thought guests couldnt access our forum without signing up to the forum and im a little worried about the content of the message .
heres a copy of what we got

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We would like to get your website on first page of Google.

All of our processes use the most ethical ""white hat"" Search Engine Optimization techniques that will not get your website banned or penalized.
Please reply and I would be happy to send you a proposal.

Sender email address: jimmypalacios12@gmail.com


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Now is this something to worry about or not , i dont really want this sort of thing happening again if it can be helped , im also not interested in the service offered as when you type our site in to google it already is found straight away
any suggestions would be greatly appreciated

Ian

You have the contact link activate on the bottom of the footer to remove it go to Admin Panel >> General Tab >> Under Messages Go to Emails and contact form >> Activate : >> No >> Save

Thank you so much MrMario
ive done what you say , thanks for your speedy reply
greatly appreciated
regards
Ian