How to correctly set the mail users come the next day after the publication of post Kunena?

How to correctly set the mail users come the next day after the publication of post Kunena? I arrive in the mail post to the day after.

My current setup and tests:

Joomla 3.4.1
JMailAlerts 2.5.2
Plugin Kunena Latest

Start time cron: 3:00
Frequency: 1 time per day:
Time measure: Day
Duration: 1

test:
When releasing the post in Kunena eg: April 23, 2015 7:00 am.
Mail with a this post but arrives April 25, 2015 at 3:00 am

- I need to mail out jmailalerts arrived April 24, 2015 at 3:00 in the morning.

How do I set up correctly?