> Well, Postfix used to look at the addresses and deduce the network class
> for that,
The WHAT?!
Classes have been dead since around 1993!
> but there have been many complaints by people that this would
> get subnets wrong. A couple of months ago, Postfix has started to look
> up the netmasks as well.
Modern software trying to work with classes should not allowed on the
Internet; people who don't know this should not allowed to write network
software.
MfG Kai
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