md2smtp monitors Linux maildirs using the kernel inotify mechanism and delivers (pushes) newly arriving mail via SMTP to a destination mail server using verified SSL endpoints. Specially designed to support DynDNS environments.
KQ-Mail is a modular SMTP mail server using kernel queues to communicate between modules.
In it\'s basic mode it is ideal to sit between the internet and your primary mail server to provide a buffer and or a SMTP RFC enforcement engine