Delivery Queue
In general, emails are delivered to the destination server directly and not stored on the filtering machines. But whenever an email destination server for an account is temporarily unavailable, all filtered mails are queued in the CASG servers for delivery at a later time. Emails that are permanently rejected by the destination server with a 5xx error code will not be queued and rejected by the CASG system. The queued emails can be accessed in the CASG interface and from here they can be manually force retried for delivery.
The queued messages on CASG severs are automatically retried for delivery for up to a period that is set in 'Maximum days to retry ' field in domain settings (for example, 4 days). The automatic retry schedule is given below:
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During the first two hours, the queued messages are retried for delivery at a fixed time interval of 15 minutes.
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During the next 14 hours, the queued messages are retried for delivery at a variable time interval starting from 15 minutes and multiplied by 1.5 with each attempted delivery. For example, after the first 15 minutes, the subsequent attempts will be after 22.5 minutes, 34 minutes and so on.
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From 16 hours since the delivery failure and up to 4 days, the queued messages are retried for delivery at a fixed time interval of every 6 hours.
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After a period of 4 days, all queued messages will be bounced to respective senders. The messages will be frozen if the bounce cannot be delivered immediately and retried for delivery at a fixed time interval of 3 days for the first 21 days. At the end of this period, delivery of messages will have failed permanently.
To manually force-deliver emails in queue
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Click 'Delivery queue' from the 'Incoming' drop-down menu in the menu bar or the
icon in the 'Incoming' configuration area.
The Incoming Delivery Queue area of the selected domain will open:
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To force-deliver a single email manually, select an email from the delivery queue and click the 'Force retry' button.
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To force-deliver all email messages in the queue, click 'Retry to deliver all messages' button.
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Note: Frozen emails can't be force delivered from CASG interface. |