I’ve used Contact Form 7 on a number of websites.
I dislike the default settings for the contact form because I like to realize when emails I get are from my website. (Also email providers like to see that the from address is actually from the same server where that domain is.) These settings also make it easier to reply to the website visitor.
Here’s what I change the Contact Form settings to:
Subject: Website Contact Request: [your-subject]
Additional Headers: Reply-To: [your-name] <[your-email]>