Quite an easy solution is to simply don't bounce. E-mail to non-existing users is probably (uncought) spam and they rarely come from legit e-mail addresses. You are spamming the actual owners of the e-mail addresses being abused by sending backscatter to them. It might even get you listed on a backscatter dnsbl.<br><br>If you want to provide legit mail senders with a "this user doesn't exist" message, configure all legit users on your edge server so mail to non-existing users is being blocked on smtp level. (This will also reject ~90% of spam) The sending party can than implement any backscatter/messages they want with this information, it's not your problem.<br><br><br><div class="gmail_quote">On 10 November 2014 12:44, Sim <span dir="ltr"><<a href="mailto:simvirus@gmail.com" target="_blank">simvirus@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hello to all!<br><br>I've a little issue...<br><br><span style="font-weight:bold">SENDER </span>(from <a href="mailto:test@extenal.com" target="_blank">test@extenal.com</a> to nomail@mydomain) ------> <b>MailScanner </b>-----><span style="font-weight:bold"> Mailbox Server</span> (@mydomain)<br><br>At this time my internal "Mailbox Server" generate a bounce for not exiting "nomail" account.<br>This bounce is detected as SPAM from MailScanner.<br><br>Note:<br>- The IP of Mailbox Server is in "Whitelist"<br>- The LAN (/24) of Mailbox Server is in "Trusted Network"<br>- The LAN (/24) of Mailbox Server is in "Outbound mail relay"<br>- All other email sent from "Mailbox Server" are detected as "white list"<br><br><code></code><br></div>Checking the log of postfix i've found this:<br><br>postfix/cleanup[20872]: C1C2960069: hold: header Received: from srv.mydomain.local (unknown [192.168.0.10])??(using TLSv1 with cipher AES128-SHA (128/128 bits))??(No client certificate requested)??by <a href="http://mail.mydomain.com" target="_blank">mail.mydomain.com</a> (Postfix) w from unknown[192.168.0.10]; from=<> to=<<a href="mailto:test@external.com" target="_blank">test@external.com</a>> proto=ESMTP helo=<srv.mydomain.local><br>[..]<br>MailScanner[19852]: Spam Checks: Starting<br>MailScanner[19852]: Message C1C2960069.AEB15 from 192.168.0.10 has no (or invalid) watermark or sender address, marked as high-scoring spam<br>MailScanner[19852]: Spam Checks: Found 1 spam messages<br><br><br>The header of postifx/cleanup is incomplete!!!!<br><br>Looking for full header i've seen: "(Postfix) with ESMTPS id C1C2960069?" and not only "(Postfix) w"<br><br><br>How to increase this "check of the header limit" in postfix, cleanup or MailScanner ?<br><br>Thanks<br></div>
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