Just some custom wrapper for PHP's mail() using QMAIL.

Unfortunately, now we're on EC2 and there's no way to pass reverse DNS lookups on e-mail originating from an instance. That's bad.

Looked through many third-party solutions, but they are expensive and impose artificial limitations, so we're basically going to get another machine outside of EC2 and use that.

Delivering e-mail reliably does have a slight learning curve, but it's really not worth it to go third-party unless you're sending heavy HTML newsletter type e-mails to hundreds of thousands or millions of people. Knowledge of e-mail and the issues surrounding its successful delivery is knowledge you can carry from project to project or start-up to start-up, so it's not such a bad idea.