Hello, according to the docs, when there is a "high volume" of mail in the active queue, then a connection is added to the cache, How is "high volume" determined? Below is the quote from the documentation:
"On-demand connection caching. This is enabled by default, and is controlled with the smtp_connection_cache_on_demand configuration parameter. When this feature is enabled, the Postfix smtp(8) client automatically saves a connection to the connection cache when a destination has a high volume of mail in the active queue"
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