# Reply-key variable doesn't get expanded in email custom headers

**URL:** https://meta.discourse.org/t/reply-key-variable-doesnt-get-expanded-in-email-custom-headers/205134
**Category:** Bug
**Created:** [October 4, 2021, 9:32am UTC](https://meta.discourse.org/t/reply-key-variable-doesnt-get-expanded-in-email-custom-headers/205134 "2021-10-04T09:32:21Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![sam](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/sam/32/102149_2.png) [@sam](https://meta.discourse.org/u/sam)
#### Post date: [October 6, 2021, 2:04am UTC](https://meta.discourse.org/t/reply-key-variable-doesnt-get-expanded-in-email-custom-headers/205134/4 "2021-10-06T02:04:38Z")

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@zogstrip any ideas about:

> [@Confusion between Reply To and Reply List in email responses](https://meta.discourse.org/t/confusion-between-reply-to-and-reply-list-in-email-responses/179513/42):
>
> The underlying problem is that Discourse unnecessarily sets the List-Post header, which makes Thunderbird think it’s a mailing list, which affects the replying options presented by Thunderbird.

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