Exchange Server

KB# 258745: Internet Mail Service – STOP DNS Lookups

Start Registry Editor (Regedt32.exe).

Locate the following key in the registry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIMC\Parameters

On the Edit menu, click Add Value, and then add the following registry value:

Value Name: DisableReverseResolve

Data Type: REG_DWORD

Radix: Binary

Value: 1

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