If you have a Qmail server and you want to allow a specific IP to send emails (relay) through Qmail all you have to do is to add in /etc/tcprules.d/tcp.smtp :
IP:allow,RELAYCLIENT=””,RBLSMTPD=””,NOP0FCHECK=”0″,DKSIGN=”/var/qmail/control/domainkeys/domain.com/dkim1″
Where IP is the IP of your remote email server. You can even specify something like : aaa.bbb.ccc.:allow,RELAYCLIENT=””
After this you have to run :
tcprules /etc/tcprules.d/tcp.smtp.cdb /etc/tcprules.d/tcp.smtp.tmp < /etc/tcprules.d/tcp.smtp
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