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?
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