mail.draft automation events can modify any property on a new or resumed draft after a worker clicks on a ‘Compose’ or ‘Reply’ button, but before the editor popup opens.

Automations on this event are cumulative – multiple automations can modify the draft, with subsequent changes on the same fields overwriting earlier ones.

When setting custom_fields:, their uri field can be used as the key instead of IDs. New custom field changes are merged with existing fields.

Placeholders

The automation event dictionary starts with the following values:

Key	Type	Notes
`draft_*`	record	The draft record. Supports key expansion.
`is_resumed`	bool	`true` if the draft was resumed, `false` if new

Outputs

Key	Type	Notes
`draft:params:`	dictionary	A dictionary of draft parameter modifications