The number of recipient descriptors is set to %1. This is the number of recipients transmitted at a time to the Microsoft ...

The number of recipient descriptors is set to %1.  This is the number of recipients transmitted at a time to the Microsoft Exchange MTA.  This number can be set in the registry under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersPrivate  using the value Recipient Descriptors.  The value should not be larger than 10 (0x0a) and not smaller than 5.
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