Hi everyone, I just heard about qpsmtpd (http://develooper.com/code/qpsmtpd/) which is a qmail-smtpd replacement. It supports plugins that lets you control its behavior, such as checking RBL lists, integrate SpamAssassin, etc. Yes, the current qmail-smtpd can do all that but sometimes that requires patching the source and I'm not a fan of having to mess around with source codes.
Has anyone tried using qpsmtpd on their vpopmail installation? -Henry Ho