Adding throttling option for sending emails within BBNC Spark

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We send a lot of messages to recipients withing @schools.nyc.gov. We just did our 1st email in BBNC Spark and over 1800 soft bounces happened with the below log message DNR:



[Message Expired] [DOMAIN UNRESPONSIVE] failed - 421 4.0.0 #4.4.5 Too many connections from your host.



A fix that other email service providers offer is a concept called throttling. Is this coming soon?
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