I’ve set up email bouncing with Mailgun as described in Configure VERP to handle bouncing e-mails Most bounces are handled by Mailgun and then processed through the Discourse API. But some bounces are sent directly to the forum on the Return-Path address: bounce+5b6b50.9df4bb-user=domain.com@intfiction.org The forum receives these emails, but then seems to do nothing with them. In particular, the user’s bounce score is not increased. Do I need to change any other settings to make this work?

[image] Dannii: some bounces are sent directly to the forum on the Return-Path [image] Dannii: Most bounces are handled by Mailgun Why the two different behaviors? What is different here?

I found this explanation which clarified things a little: How can the Return-Path header be different than the actual email bounce recipient? email, spam, email-headers, email-bounces answered by The Surrican on 02:33PM - 05 Sep 13 UTC I don’t know the details of what is causing these incoming bounce emails. (Is there a way to view the full email? Admin only shows the address and subject.) But they’re never for common email services. Maybe the emails are being forwarded or something, so the initial SMTP send succeeds, so Mailgun is happy, but it bounces at the end server? Maybe the server is violating some RFC? It’s been happening for more than one user though, and sending a message to the Return-Path header is the correct VERP behaviour I thought.

Just showing what my admin panel tells me. There are a lot of different subject styles. [Screenshot from my admin panel]

VERP bounce replies ignored when using Mailgun

Product Support

codinghorror (Jeff Atwood) May 29, 2019, 12:54am 4

I bet @mpalmer Knows Things™ about this!

Topic		Replies	Views
Zero entries in bounced email list Product Support	3	837	April 10, 2021
Bounce score not updated Product Support	15	2485	May 9, 2018
Configure VERP to handle bouncing e-mails Self-Hosting email , how-to	10	32906	July 30, 2026
Bounced emails not being detected Product Support email	16	1840	February 7, 2024
Email suppression list handling Product Support	3	1218	August 22, 2020

VERP bounce replies ignored when using Mailgun

Related topics