Example: If you want the Newsletter to be sent 3 days before the user birthday, please enter the number 3 in the field Number of days before the birthday. If you click on the test button, AcyMailing will look at users with a birthday in 4 days (3+1) and immediately add e-mails in the queue which will be sent in 1 day, so 3 days before the user birthday. Example: If you want the Newsletter to be sent the day of the birthday, then enter 0 in the field Number of days before the birthday. If you click on the test button, AcyMailing will look at users with a birthday in 1 day and add e-mails in the queue which will be sent in 1 days, so at the birthday.