On Jul 11, 2021, at 10:12 AM, Wietse Venema <wie...@porcupine.org> wrote:
> Ron Garret: > [ Charset windows-1252 converted... ] >> >> On Jul 11, 2021, at 9:58 AM, Wietse Venema <wie...@porcupine.org> wrote: >> >>> Ron Garret: >>>> I have recently come under a backscatter spam attack from one >>>> specific domain. This domain has blacklisted my server?s IP >>>> address, and so bounce replies sent to this domain are piling up >>>> in my mail queue and I have to go through periodically and manually >>>> delete them. I don?t want to disable bounce messages in general >>>> because I don?t want incoming messages with typos in the destination >>>> address to just vanish into the cosmic void. Is there a way to >>>> disable bounce replies for a specific domain? >>> >>> Why is your server sending bounces (or any other email) to that >>> domain? >> >> Because spammers are sending messages with forged return-path headers to >> invalid addresses on my server. It?s called backscatter: > > You must reject mail for invalid recipient addresses. Otherwise, > you deserve by 100% the problem that you experience. AFAIK, I am: smtpd_recipient_restrictions = reject_unauth_pipelining, reject_non_fqdn_recipient, reject_unknown_recipient_domain, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, permit The problem is that a rejected recipient produces a mailer-daemon reply. rg
