I had to reinstall Qmail a couple months ago, and used the Memphis RPM. I
didn't pay much attention to default parameters, as I copied qmail/control
from my old install. Well it turns out that Memphis is using tcprules, and
tcprules.d/qmail-smtpd happened to be:
:allow,RELAYCLIENT=""
... Which
The cricial line in the spec file is
echo "$(ipmeprint)" | awk '{ print $0":allow,RELAYCLIENT=\"\""}'\
> qmail-smtpd
You probably were not directly on the internet when installing. The
README does warn you about this---as well as the spec file has
echo 'Please look