Subdomains and strange mail problem

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AI-generated summary

User Andro is experiencing a mail problem with Discourse on a subdomain (discourse.jackrail.space). One user is receiving a reply address of jackrail.space instead of discourse.jackrail.space. Andro suspects it’s not related to Amazon SES since other users receive the correct reply address.

omarfilip suggests investigating differences or commonalities between this user and others, such as email domain/service and client. Andro reports that the affected user uses LuxSci and Thunderbird 68.6, and is stumped.

omarfilip recommends checking for Thunderbird add-ons that might be interfering, such as those that change the reply-to address, and suggests testing with a different email client or webmail. A raw email from the affected user might also help diagnose the issue.

1

We have Discourse running fine. It’s at domain discourse.jackrail.space. Mails go out fine, and all users can send replies by email OK. Except just one user. The Reply address he is getting in his mailer is the domain jackrail.space not discourse.jackrail.space.

I am utterly baffled as to what/who/where is causing this address rewriting. It’s a showstopper to our site for various reasons.

I am using Amazon SES but I am fairly confident the problem does not lie there, as all the other users get the right reply address.

Has anybody ever seen anything like this before?

2

Try to find the differences or commonalities to narrow it down:

  1. Is there anyone else with the same email domain/service as this user, and do they have the same problem?
  2. What about the email client he’s using, and is anyone else using the same one?
3

Thanks. Nobody else with same service (luxsci). Client is up to date Thunderbird 68.6. I am very baffled. I spend a large amount of my time setting up enterprise Postfix systems, but I have never seem this type of error. There’s something new every day!

4

Does he have any add-ons in Thunderbird that might be interfering here? A cursory search for thunderbird changing reply-to came up with this, for example:

https://addons.thunderbird.net/en-US/thunderbird/addon/stop-ignoring-reply-to/

Also, it might help if you can get the raw email that he receives and maybe having him try a different email client or webmail if available to test.