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SMTP relay entries

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linux-howto

http://serverfault.com – By default, my mail server (Snow Leopard) contains an entry to only accept SMTP relays from 127.0.0.0/8. However, when I attempt to check the option and save, the computer unchecks it. When I change the IP address to just 127.0.0.0, I don't experience the unchecking problem. There are two possible solutions: either do you know what is causing the unchecking problem (or which configuration file should I edit to manually do this?), or is it acceptable to simply only have 127.0.0.0 as the IP address? (HowTos)