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How to clear an email deployment queue

Email deployment queues become too full for various reasons, including:

  • Email throttling
  • Sending email to a large number of recipients in a short period of time 

If it happens, clear the queue slowly so you don't flood mailbox providers. A sudden surge in email volume may be perceived as spam, lead to deferred messages, and clog the queue all over again.

If the cause is reputation-based throttling, address the reputation issues. Otherwise, throttling will continue and the queue will continue to back up.

Clearing a queue
The approach to take to clear a queue depends on what caused it.

To clear a queue caused by reputation-based throttling:  

  • Slowly increase connection and throughput settings back to recommended settings for each mailbox provider. (Recommended settings appear in Return Path's Connection and Throughput Guide.) 
  • Slowly increase the sending volume per hour.
  • Slowly increase the sending volume per minute.
  • Slowly increase the batch size of emails back to a normal level.
  • Slowly decrease retry times back to normal levels.
To clear a queue caused by sending too much email in a short period of time:
  • Spread out the deployment (and perhaps segment it) over a full day or over a few days.
  • Limit the number of retries to two or three so you don't keep trying to send the same message repeatedly. Increase the number of retries once the queue returns to normal.
  • Ensure that messages sent to unknown users or malformed domains are not sent again by adding  the addresses to your suppression list.
  • Slowly increase connection and throughput settings back to recommended settings for each mailbox provider. (Recommended settings appear in Return Path's Connection and Throughput Guide.)





 

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