Configuration/Core/controller/jobs/order/email/payment/default/limit-days

Summary
Only send payment e-mails of orders that were created in the past within the configured number of days

controller/jobs/order/email/payment/default/limit-days = 30


 * Default: 30
 * Type: integer - Number of days
 * Since: 2014.03

Description
The payment e-mails are normally send immediately after the payment status has changed. This option prevents e-mails for old order from being send in case anything went wrong or an update failed to avoid confusion of customers.