added vpopmail_ext to qmail_deliverable plugin
added vpopmail_ext to qmail_deliverable plugin

priyadi/qpsmtpd,sieutruc/qpsmtpd,smtpd/qpsmtpd,priyadi/qpsmtpd,priyadi/qpsmtpd,sieutruc/qpsmtpd,smtpd/qpsmtpd,sentinelleader/qpsmtpd-dev,salvis/qpsmtpd,msimerson/qpsmtpd,salvis/qpsmtpd,sentinelleader/qpsmtpd-dev,sieutruc/qpsmtpd,msimerson/qpsmtpd