While hMail does have SPAM filters, they are not as aggressive as our other "enhanced" service, RackMail. Turning on greylisting will help quite a bit in reducing the amount of junk email messages that come into your mailbox account.
You can help the situation by not opening yourself up to be a target of Spammers by NOT putting your email address on your website. The purpose of your Contact Us form is to allow you to receive emails without publishing your email address. Once your email is "public" all Internet crawlers; both the good and bad guys, now know how to reach you.
You may think you are receiving too much junk mail. Understand that 90%-95% of the junk mail is never deposited into your mailbox account. | 
