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One of the big issues on having a contact form on your website is the spam it attracts. Once your site gets listed on the radar for these spammers then there is simply no end to the endless stream of spam that will show up in your mailbox. There are 2 main ways to handle this:
1. Use a captcha/formula
These are the funny looking characters/numbers that are randomly generated so that bots cannot go through them. Equally irritating is the fact that humans too may have a tough time getting through these! A variation of these captcha is the formula based captcha where a basic algebraic equation is presented and the user is requested to compute the missing value.

2. Honeypot captcha
This relies on the weakness in spambots to just fill in fields that seem to be marked as mandatory but which are actually just a bait to know that the submission is coming from a bot. A human user would never see (or if using a text browser clearly see that the label for the field shows that it is for spammers only) this field and the system would be able to filter out if the submission is valid or not. This clearly seems to be a better solution and can be applied to both contact forms and comment forms in WordPress.

Choose any of the anti-spam methods that seems to work well for your situation – but do ensure that you have at least some mechanism in place.