I went through qmail-smtpd and added a bit of code to
do a gethostbyaddr. If I don't get a value, I refuse the
mail due to no reverse DNS. Now looking over some
comments in this list and with a little closer look at the
setup routine in qmail-smtpd.c it appears if the name
cannot be resolved, remoteip and/or remotehost get
set to 'unknown'. Would it make sense to deny mail if
either of these is 'unknown'. and/or set tcpserver
option -p?
Thanks,
mike.
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