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locking down server

From: Anne Ramey (annerblast.com)
Date: Tue Dec 07 2004 - 12:17:59 CST

I want to lock down my server to only accept mail from a given set of
IPs. Am I correct that I would make I fie of the format
IP OK
next IP OK

and do this in my main.cf
smtpd_recipient_restrictions = /etc/postfix/my_acceptable_ips, reject
??

I think this is what I got from the help files, but I wanted to double
check before I did something so drastic.

Thanks,
Anne