# Reducing backscatter in email interface? **URL:** \ **Category:** Feature\ **Created:** [March 27, 2017, 3:36pm UTC](https://meta.discourse.org/t/reducing-backscatter-in-email-interface/59974 "2017-03-27T15:36:31Z")\ **Posts on this page:** 1\ **Showing post:** 19
**Author:** ![icculus](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/icculus/32/120985_2.png) [@icculus](https://meta.discourse.org/u/icculus)\ **Post date:** [December 8, 2020, 6:07am UTC](https://meta.discourse.org/t/reducing-backscatter-in-email-interface/59974/19 "2020-12-08T06:07:59Z")
Hey, reviving an old thread here, because some form of the never-applied mail-receiver patch _did_ eventually make it into revision control, and as things bitrot over time, my patched container stopped working at some point. I blew away my mail-receiver container, set up a fresh container and API key, and I have incoming mail working on my Discourse instance again…but the system seems to be backscattering rejected mail like it’s 2017 again. ![2020-12-08_00-55](https://global.discourse-cdn.com/meta/original/3X/0/e/0efaf5cae3e2fdbb1e96634bc1882e3e52f05eee.png) Sure enough, these rejection replies both came back to my inbox, even though the BadDestinationAddress one should have been rejected at the SMTP level before being sent on to Discourse for further processing and a reply email. If a spammer hits this server with a bogus email address, this would generate backscatter. Talking directly to the SMTP server, I can see it doesn’t make any attempt to reject bogus emails. ```plaintext root@discourse:/var/discourse# telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 ESMTP server HELO sdfsdfsdf 250 discourse-mail-receiver.localdomain MAIL FROM: sdfsdf@example.com 250 2.1.0 Ok RCPT TO: sdfsdfsdf@discourse.libsdl.org 250 2.1.5 Ok ``` …all this to say: I can see the default mail-receiver image has a fast-rejection script hooked up, but it doesn’t seem to be rejecting things…? /etc/postfix/master.cf: ```plaintext policy unix - n n - - spawn user=nobody argv=/usr/local/bin/discourse-smtp-fast-rejection ``` /etc/postfix/main.cf: ```plaintext smtpd_recipient_restrictions = check_policy_service unix:private/policy ``` Is there something I need to tweak to make this work, or is there some way to dig deeper into why it isn’t working? Is it working for other people? Thanks! --- _[View the full topic](https://meta.discourse.org/t/reducing-backscatter-in-email-interface/59974)._