Qmail, a lightweight SMTP + POP3 server, is now available for QNX 6.
Small footprint. Easy to configure, easy to run. You can read more and get it here: http://mikep.qnx.org.ru/qmail.htmlBinary distribution is in tar.gz format for now.
I'm going to compile .qpr soon - it would be available through QOpenCD by Mike Gorchak or from my page.