is your qmail open relay?

there are many open relay tester on the internet. some of them are designed for sendmail and not suitable for qmail. here’s a service i found months a go, it’s from my offline documentation.

login to your qmail server and do
$telnet rt.njabl.org 2500

wait a while and then do

$telnet rt.njabl.org 2501

wait a while and then from a browser open this, and type your qmail IP address then click Run Query. a report will be generated for you.