Ask HN: Simplest way to send emails to myself?

I need an email server that I can put on a VPS. I'm going to send emails only to myself, so I don't care about spam, identity verification etc. It needs to support SMTP, so I can send from multiple servers (automated messages). I also don't care about receiving emails on this server, so if I can block that it would be great.

What's the simplest way to do this? Can someone point me in the right direction?