> ## Documentation Index
> Fetch the complete documentation index at: https://docs.open.cx/llms.txt
> Use this file to discover all available pages before exploring further.

# Patch channels

> Set an email address's reply template. Every reply sent from the address uses the new version immediately.

Send `null` or an empty string to reset the address to the default template. A template without `{{content}}` is rejected with `400`. Requires the `email:write` scope.

See [Reply Templates](https://docs.open.cx/email/reply-templates.md) for every variable, including the per-agent `{{agent_name}}`, `{{agent_title}}` and `{{agent_email}}`.


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