"Push" Feedback Retry Policy
PostalMethods will make several attempts to call back your server with the status of a letter. The following policy applies when your server does not confirm the reception of a status callback.
HTTP POST & SOAP XML
|Postback Result||Returned Error Code||Retry Schema|
|Error||(Non-zero or no response)||Every 60 seconds for up to 60 minutes.|
Unless a terminal error message is returned from the receiving SMTP server, messages will retry every 5 minutes for up to 120 minutes.