I run a postfix email server on my home server. I've been getting a lot of spam, and the email address it is being sent to is "mail@servername.com"

I don't have a user named 'mail'. I have this account aliased to another email so I can pop these mails and get rid of them. However, I'd like to make it so the server just rejects any mail going to this email address and I'm not sure how.

It's a small server and I only use it for personal emails, really. I have one email account on it only that I rarely use. The web server is used for a photo gallery.

What is the best way to reject any emails coming to mail@servername.com? I don't have a catch all email address, and I don't want one.