ErrorCodesInvalidDomainInCache Field
It's known (from the DNS cache) that the requested domain name does not exist.

Namespace: MailBee
Assembly: MailBee.NET (in MailBee.NET.dll) Version: 12.5.0 build 687 for .NET 4.5
Syntax
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public const int InvalidDomainInCache

Field Value

Type: Int32
Remarks
It does not make sense to make DNS MX query regarding the domain name since the previous attempt to do so produced negative response from the DNS server and this fact was recorded in the DNS cache. The developer can use Clear and Timeout members of DnsCache class to affect this behavior.
See Also