[GH-ISSUE #1197] Mail for non-existing users is not rejected during SMTP dialog #977

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opened 2026-02-27 11:14:33 +03:00 by kerem · 4 comments

kerem commented

2026-02-27 11:14:33 +03:00

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Originally created by @helgew on GitHub (Jul 27, 2017).
Original GitHub issue: https://github.com/modoboa/modoboa/issues/1197

Impacted versions

Modoboa: 1.7.4
installer used: Yes
Webserver: Apache

Current behavior

After removing a user who received a lot of spam, messages for the now deleted user are still processed for spam and quarantined.

Expected behavior

Mail for non-existing users should be rejected outright.

Originally created by @helgew on GitHub (Jul 27, 2017). Original GitHub issue: https://github.com/modoboa/modoboa/issues/1197 # Impacted versions * Modoboa: 1.7.4 * installer used: Yes * Webserver: Apache # Current behavior After removing a user who received a lot of spam, messages for the now deleted user are still processed for spam and quarantined. # Expected behavior Mail for non-existing users should be rejected outright.

kerem closed this issue

2026-02-27 11:14:34 +03:00

kerem commented

2026-02-27 11:14:34 +03:00

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@tonioo commented on GitHub (Jul 28, 2017):

@helgew Actually, it is a normal behaviour if you installed Modoboa using the installer. Spam detection comes after postscreen and before postfix verifies if recipient exists. (see http://www.postfix.org/SMTPD_PROXY_README.html)

@tonioo commented on GitHub (Jul 28, 2017): @helgew Actually, it is a normal behaviour if you installed Modoboa using the installer. Spam detection comes after postscreen and before postfix verifies if recipient exists. (see http://www.postfix.org/SMTPD_PROXY_README.html)

kerem commented

2026-02-27 11:14:34 +03:00

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@helgew commented on GitHub (Jul 28, 2017):

I see. Would you have any advice on how to configure smtpd_reject_unlisted_recipient so that it would work with the virtual recipients configured via modoboa? My understanding is that smtpd_reject_unlisted_recipient kicks in during the SMTP dialogue.

@helgew commented on GitHub (Jul 28, 2017): I see. Would you have any advice on how to configure [`smtpd_reject_unlisted_recipient`](http://www.postfix.org/postconf.5.html#smtpd_reject_unlisted_recipient) so that it would work with the virtual recipients configured via modoboa? My understanding is that `smtpd_reject_unlisted_recipient` kicks in during the SMTP dialogue.

kerem commented

2026-02-27 11:14:34 +03:00

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@tonioo commented on GitHub (Aug 9, 2017):

I think it'd work, but after postscreen and amavis checks (which is not a bad thing, think about a ddos using fake addresses). Have you tried to activate this setting?

@tonioo commented on GitHub (Aug 9, 2017): I think it'd work, but after postscreen and amavis checks (which is not a bad thing, think about a ddos using fake addresses). Have you tried to activate this setting?

kerem commented

2026-02-27 11:14:34 +03:00

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@tonioo commented on GitHub (Sep 15, 2017):

Inactive thread => close.

@tonioo commented on GitHub (Sep 15, 2017): Inactive thread => close.