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re: It's easier than this hint says
Authored by: davidmorr on May 20, '04 01:53:25AM

It's probably not a good idea in general to allow your Mac to relay mail from anyone on your subnet. If one of those machines gets hacked, then it could start sending spam or worse through your Mac.

To prevent this, leave this line enabled:

# THE FOLLOWING DEFAULTS ARE SET BY APPLE
#
...
# turn off relaying for local subnet
#
mynetworks_style = host

Postfix will accept messages originating on the same machine for any Internet address. However, it will not accept mail from anywhere else unless the destination is an address on postfix's machine.

David



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