The discussion addresses a bug where the reply-key variable doesn’t expand in email custom headers, causing issues for Thunderbird users replying to Discourse notifications. Flominator highlights the problem, linking to a related thread. Sam seeks input from zogstrip, who suggests removing the List-Post header, which is no longer needed and causes issues. nbianca confirms the List-Post header has been removed and that %{replace_key} will now be replaced in custom headers. Flominator reports that the fix resolves the issue, even without custom headers.
Hi there,
while trying to fix the problem that Thunderbird users cannot reply to Discourse notification emails I discovered this matter. Details at Confusion between Reply To and Reply List in email responses - #40 by Flominator
Can we fix this? Is there maybe a patch or something?
Thanks in advance
Flo
@zogstrip any ideas about:
@nbianca can you add to your list to look into whether we still need the List-Post header?
It seems like it’s no longer required and, even worse, is causing issues 
We removed the List-Post email header and will replace %{replace_key} in custom headers too. Can you please update and check if it solves your problems?
This one I managed to test last evening and it looks good. The other one I will hopefully be able to test this evening or during the weekend. Thank you!
Update: Also works without the custom headers!
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