Reference Manual
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"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
The following applies to feedback sent by HTTP POST and to feedback sent by SOAP XML.
| Postback Result | Returned Error Code | Retry Schema |
|---|---|---|
| Success | 0 (zero) | None |
| Error | (Non-zero or no response) | Every 60 seconds for up to 60 minutes. |
SMTP
Unless a terminal error message is returned from the receiving SMTP server, messages will retry every 5 minutes for up to 120 minutes.