Maybe this is not the best practice, however I don't block any incoming mail (destined for a legit address) for the same reason. I use a program called SpamAssassin Quarantine and I let it scan for the spam.
Spam is put in quarantine and doesn't effect the users. It sends out an email every day letting the user release the mail. Hope that helps -----Original Message----- From: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] On Behalf Of Kay Sent: Thursday, March 18, 2010 2:43 PM To: postfix-users@postfix.org Subject: Mail rejected on "Received From" Hi guys, I often see mail being rejected by recipient servers because an IP in a Received From header is blacklisted somewhere. This strikes me as a rather bad practise, since it undermines the whole idea of SMTP authentication. Here's an example reject: 550 5.7.1 This system has been configured to reject your mail. An IP address (xx.xx.xx.xx) found in the message's 'Received:' headers is listed by the lookup site 'sbl-xbl.spamhaus.org.'. xx.xx.xx.xx is the client's IP, a regular dynamic IP on a broadband connection. Which shouldn't have any relevance. To make matters worse, the offending recipient site does not accept mail for abuse/postmaster or any of the usual aliases. How do you engage hosts like these to resolve such issues? Thanks K
