# 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:** 29

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### Author: ![lavamind](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/lavamind/32/237909_2.png) [@lavamind](https://meta.discourse.org/u/lavamind)
#### Post date: [January 21, 2026, 5:08pm UTC](https://meta.discourse.org/t/unexplained-email-invalidpost-errors/377793/29 "2026-01-21T17:08:37Z")

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Offhand, the reason doesn’t seem to stick: the account is active, not suspended nor silenced. However I noticed the account is _not_ “staged”, which is the case for most of the accounts whose mailing list posts do end up in Discourse. All of the posts from non-staged users are from members of the moderation team.

Our mailing list mirror category was initially set up using this guide: [Mirroring a read-only mailing list in Discourse](https://meta.discourse.org/t/mirroring-a-read-only-mailing-list-in-discourse/77990)

However, I just reviewed the configured permissions on the category and it seems like our moderators group was added, and `everyone` was given `reply` permissions.

I’ve removed these extra permissions and left only `everyone` with the `see` permission. Perhaps these “extra” permissions are interfering with the way Discourse handles these special “mailing list mirror” categories?

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