# Email notifications fail if duplicate headers exist

**URL:** <https://meta.discourse.org/t/email-notifications-fail-if-duplicate-headers-exist/222960>\
**Category:** Bug\
**Created:** [April 2, 2022, 9:33pm UTC](https://meta.discourse.org/t/email-notifications-fail-if-duplicate-headers-exist/222960 "2022-04-02T21:33:09Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![wusel](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/wusel/32/255451_2.png) [@wusel](https://meta.discourse.org/u/wusel)\
**Post date:** [April 3, 2022, 9:42am UTC](https://meta.discourse.org/t/email-notifications-fail-if-duplicate-headers-exist/222960/5 "2022-04-03T09:42:58Z")

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Yes, it is a [standard install](https://meta.discourse.org/t/142537?silent=true); AFAICS there is only one container running. (Bring up a new VM, repoint DNS, apt update, apt dist-upgrade, reboot, git pull, ./discourse-setup, Web-based setup, upload backup, restore backup, re-enable mail, see the errors again.) Note that the old install was able to email the link to the backup, and sending test emails still works in the new install — it’s seemingly only posting-related mails that fail.

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_[View the full topic](https://meta.discourse.org/t/email-notifications-fail-if-duplicate-headers-exist/222960)._