3-A: TCP.SMTP & TCP.CDB
This part may no be about launchers but be sure that launchers invoke cdb file a lot.
nano /etc/tcp.smtp
##BEGIN PASTE
#As the Qsmtp author points, there is no need for RELAYCLIENT on this file, as many other installations use.
#If you want to enable relaying, yo must do via relayclients and relayclients6 files in /var/qmail/control
#NOW SOME EXAMPLES FOR BLACKLISTING VIA CDB
=.desktop.com.br:allow,RBLSMTPD=" 554. SMTP Policy of DOMAIN doesn't accept traffic SMTP from generic cable/dsl"
=.fleetmailer.net:allow,RBLSMTPD=" 554. SMTP Policy of DOMAIN doesn't accept traffic SMTP from generic cable/dsl"
=.publishot.com:allow,RBLSMTPD=" 554. SMTP Policy of DOMAIN doesn't accept traffic SMTP from generic cable/dsl"
#END OF PASTE
tcprules /etc/tcp.smtp.cdb /etc/tcp.smtp.tmp < /etc/tcp.smtp