The Internet Mail Connector (IMC) caches all successfull DNS lookups, to a maximum of 1,000 entries. This prevents DNS load-balancing from working.
You can turn off IMC's caching by navigating to:
HKLM\System\CurrentControlSet\Services\MSExchangeIMC
Add Value name DestinationDomainThreshold as a type REG_DWORD and set the value to 0. The default is 1,000.
0 comments
Hide comments