How to add a rule?

1. Click on "Add New Rule" button.

2. Select the email template you want to use as a email reminder for sending. You can create and customize email templates on the emails settings page.

3. Configure one or several conditions.
Note. If your condition is for a date field, then you can use a configuration that can be used in the strtotime function.

For example:

Sending Reminder email, 1 day before the event.
It means that, if today is "2021-12-01", we need to search for all contacts with check_in date: "2021-12-02" ( e.g. TODAY + 1 DAY). If check_in date field contain times (like 2021-12-02 10:01:00), then we need to use 2 conditions:

check_in > TODAY + 1 DAY ( e.g. 2021-12-02 00:00:00 )
check_in <= TODAY + 2 DAYS - 1 SECOND ( e.g. 2021-12-02 23:59:59 )

Follow-up email. 7 days after the event (TODAY - 7 DAYS):

check_in > TODAY - 7 DAYS
check_in <= TODAY - 8 DAYS + 1 SECOND

After 1.5 months (TODAY - 1 MONTH - 15 DAYS):

check_in > TODAY - 1 MONTH - 15 DAYS
check_in <= TODAY - 1 MONTH - 15 DAYS + 1 SECOND

4. Click on Create Rule button.