# How to debug email sending issues? (some recipients don't get some emails)

**URL:** <https://meta.discourse.org/t/how-to-debug-email-sending-issues-some-recipients-dont-get-some-emails/413610>\
**Category:** Product Support\
**Created:** [September 29, 2026, 9:12pm UTC](https://meta.discourse.org/t/how-to-debug-email-sending-issues-some-recipients-dont-get-some-emails/413610 "2026-09-29T21:12:00Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![sjjh](https://avatars.discourse-cdn.com/v4/letter/s/d2c977/32.png) [@sjjh](https://meta.discourse.org/u/sjjh)\
**Post date:** [September 30, 2026, 7:06pm UTC](https://meta.discourse.org/t/how-to-debug-email-sending-issues-some-recipients-dont-get-some-emails/413610/5 "2026-09-30T19:06:03Z")

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> [@merefield](#):
>
> I used a coding agent to summarise when emails are suppressed in mailing list mode:

Thanks, as an admin I mocked the user and I’ll go to each of it to debug the case:

- General: mailing list mode is activated in the user settings (via global setting)

> [@merefield](#):
>
> - The user muted the topic, category, or one of its tags.

- the topic is not muted (in topic view)
- no category is muted (in user settings)
- the topic does not use any tag (in topic view)

> [@merefield](#):
>
> - The user muted or ignored the author.

- no user is muted (in user settings)

> [@merefield](#):
>
> - The user cannot access the post - for example, it is in a restricted category.

- the user can access the post

> [@merefield](#):
>
> - The account is inactive, silenced, suspended, or awaiting required approval.

- the account is not inactive, silenced, suspended, or awaiting required approval

> [@merefield](#):
>
> - The user chose to exclude their own posts.

- the post is from a different user

> [@merefield](#):
>
> - The post or topic was deleted before delivery.

- the post (and topic) is not deleted

> [@merefield](#):
>
> - Previous delivery failures pushed the user’s bounce score over the configured threshold.

- the user received an email to another topic on the same day, thus the bounce score seems not have been active.

So what else can it be? How can I debug the issue further? I’m a little lost… :-/

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