Last updated March 2020
memory_hwm — configure physical memory usage high-water mark
Memory_HWM = 95
The memory_hwm directive allows you to specify the maximum percentage of physical memory that should be used during normal operation. If this threshold is exceeded, new mail will be transiently failed and the server will aggressively free up resources to bring memory usage within acceptable bounds. The default value for this option is
memory_hwm is valid in the global scope.
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