Backoff, urgentbackoff, normalbackoff, nonurgentbackoff Channel Options

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Delivery retry intervals (backoff, urgentbackoff, normalbackoff, nonurgentbackoff)

Backoff options specify the frequency of message delivery retries when messages aren't successfully delivered the first time. These options all accept a series of intervals as arguments. The first interval specifies the time to wait before the first retry, the second specifies the time to wait for the second retry, and so on. The last value given specifies the time to wait for all subsequent retries. Up to eight intervals can be specified. Deliveries are attempted for a period of time specified by the notices channel option. Delivery will fail if successful delivery cannot be made within the time allowed by the last notices channel option setting.

Interval values use ISO 8601 periodic time syntax:

P[yearsY][monthsM][weeksW][daysD][T[hoursH][minutesM][secondsS]]

years, months, weeks, days, hours, minutes and seconds are all integer values.

Separate interval settings are allowed for messages with different priority settings. The urgentbackoff channel option sets the retry intervals for urgent messages, normalbackoff sets the retry intervals for normal priority messages, and nonurgentbackoff sets the interval for non urgent messages. backoff sets the retry intervals for all messages regardless of priority.

The default intervals between delivery retries attempts in minutes are:

urgent: 30, 60, 60, 120, 120, 120, 240
normal: 60, 120, 120, 240, 240, 240, 480
nonurgent: 120, 240, 240, 480, 480, 480, 960