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Hi, should i use the Email block to send email on task fail? Or should i write a function to send email on task fail hook? Thank you

If you use an email block, you could reference it in an <https://docs.prefect.io/3.0/automate/events/automations-triggers#sending-notifications-with-automations|automation> to send an email when a flow run fails. For a task run failure, you could use a `on_failure` hook to send an email.

IIRC, you can't use the email notification block directly in code