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Am 02.11.2011 16:43, schrieb Keith Steensma:
> It's been a long time since I have participated in this list (goes to show how good Postfiix is when it can run for
> years with so few problems). Our company has decided to start using an outside SPAM filtering service. Overall,
> this is doing a very good job. But we are getting SPAM directly into out system and I need to block all outside
> SMTP connections except the connections from a group of 8 IP address'
what about close port 25 via iptables and open only for the spamfilter-ips
and let customers only use port 587 (submission) with smtp-auth?