Specify the minimum delay (in days) between the first received bounced back message and the latest received bounced back message.<br><br><span style="text-decoration: underline;">Example</span> : if you specify 3 (which means 3 days), the system will only execute the following actions if there are minimum X bounced back messages received and the elapsed time between the first received bounced back and the latest one is minimum 3 days.<br><br>