> For the complete documentation index, see [llms.txt](https://docs.emaildelivery.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.emaildelivery.com/docs/backend-administration/purging-mail-queues.md).
# Purging mail queues
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**Purge all undelivered mail**
You can purge all undelivered broadcast, funnel, and transactional mail in the backend customer account table.
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**Click customers -> Customer Accounts**
**Check the customer account whose mail you want to purge:**
**Use the action menu to purge mail queues:**
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**The most reliable way to cancel a broadcast in progress is always to purge broadcast mail from the backend customer account menu.**
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Clicking "Cancel" in the Actions button from the broadcast page will cancel a broadcast sent through Velocity MTA, but may not be able to cancel a broadcast sent through an API or SMTP Relay connection depending on the state of the data transfer at that time.
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To manage Velocity MTA mail queues see the [MTA documentation](/docs/velocity-mta-continuing-education/complaint-feedback-loops.md).
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