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JSI Tip 0983. DNS load-balancing and IMC name caching are mutually exclusinve.

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:


Add Value name DestinationDomainThreshold as a type REG_DWORD and set the value to 0. The default is 1,000.

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