# Can I have scheduled emails sent at a specific time of the day?

You can use HBook filters to adjust a **sending window**, but it is not possible for the emails to be sent at an exact specific time.

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### How do the scheduled emails work?

- We use WordPress scheduled events, that are cron jobs which are automatically set to run hourly. Therefore, theoretically, HBook checks hourly if there is a scheduled email that has to be sent.
- However, these cron jobs actually run only when someone visits your website, either from the backend or front-end. That is why emails can be not be sent at a specific time of the day.

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### What is the default sending window?

By default, HBook sends emails between 7am and 11pm.

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### Can I modify this sending window?

Yes, you can use the following HBook filters:

- [hb\_scheduled\_min\_hour](https://maestrel.atlassian.net/wiki/spaces/HD/pages/34734482/Plugin+customization#hb_scheduled_min_hour)
- [hb\_scheduled\_max\_hour](https://maestrel.atlassian.net/wiki/spaces/HD/pages/34734482/Plugin+customization#hb_scheduled_max_hour)