While each of these [PEAR Mail, PhpMailer, SwiftMailer, Zend_Mail] will work with Solar, the new Solar_Mail and Solar_Smtp packages work "natively", in that they support automatic configuration, locale and exception inheritance, and so on. Read on for some examples on how to use them.
In his example he sets up and sends a simple message, setting the contents of the email (sent as an HTML message). Since there's been much talk about the safety of a lot of the mailing systems in frameworks, Paul talks about how it's been secured from header injections, through safe attachments, and from a transport dependency-injection for SMTP.
There's even a method included that lets you take the SMTP information out of the script and put it into the Solar configuration file to use in the entire application.