A buffer overflow vulnerability in qwik-smtpd version 0.3 enables mail relay possibilities.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/35403/qwik-smtpd-djb.txt
Source: https://packetstormsecurity.com/files/35403/qwik-smtpd-djb.txt.html