# Unexplained Email::Receiver::InvalidPost errors

**URL:** https://meta.discourse.org/t/unexplained-email-invalidpost-errors/377793
**Category:** Bug
**Created:** [August 7, 2025, 8:31pm UTC](https://meta.discourse.org/t/unexplained-email-invalidpost-errors/377793 "2025-08-07T20:31:32Z")
**Posts on this page:** 1
**Showing post:** 36

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### Author: ![supermathie](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/supermathie/32/507518_2.png) [@supermathie](https://meta.discourse.org/u/supermathie)
#### Post date: [February 4, 2026, 6:18pm UTC](https://meta.discourse.org/t/unexplained-email-invalidpost-errors/377793/36 "2026-02-04T18:18:06Z")

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> [@lavamind](#):
>
> Should I be using a different email address here? If so, which one?

No, this is all fine.

The piece that you _might_ be missing is this one:

> [@Mirroring a read-only mailing list in Discourse](https://meta.discourse.org/t/mirroring-a-read-only-mailing-list-in-discourse/77990/1):
>
> Set “Custom incoming email address” to the mailing list’s email address (e.g., `mailing-list@foo.test`)

(remember that Discourse only uses the message headers (To/CC) and does _not_ know the envelope-to address)

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_[View the full topic](https://meta.discourse.org/t/unexplained-email-invalidpost-errors/377793)._