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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