Mark Constable writes:
We are unfortunate enough to get ourselves listed here a week or so ago and they want to charge 50E$ to become unlisted but we refuse to pay as we feel it's outright extortion.-> http://www.backscatterer.org/?target=usage I've been using these settings for years, bofh has... opt BOFHSUPPRESSBACKSCATTER=smtp,authsmtp and courierd has... ESMTP_BLOCKBACKSCATTER=smtp/dsn,authsmtp/dsn Am I missing anything to prevent any/all backscatter in the future?
No, however nothing could stop an unsophisticated recipient from installing an autoresponder via a .mailfilter that explicitly invokes $SENDMAIL to send a reply to the purported sender. To Courier, the new message is indistinguishable from any original message not sent in response to anything.
You can freely ignore that web site. Its operator has … a reputation.But really, the only absolutely bulletproof way to avoid having a backslash to backscatter is to use a separate, dedicated smarthost for outgoing mail from clients. The only mail that would originate from your mail server that hosts your mailboxes would be any autoreplies, or similar mail filter-generated mail.
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