Randomly these errors are showing in the console, most of the time the notifications work properly.

Error   9005 Error executing SmartFunction. Parameters: guid = SendEmail, majorVersion = SystemPolicies, minorVersion = 1, serialize
dFacts = "blah blah blah email stuff........"
- Exception:    at SourceCode.SmartFunctions.Engine.Runtime.ExecuteSmartFunction(String name, String nameSpace, Int32 majorVersion,
Facts facts, String user)
   at SourceCode.SmartFunctions.Runtime.SmartFunctionEngine.Execute(String name, String nameSpace, Int32 majorVersion, String serial
izedFacts)
Error   2025 Error Marshalling SourceCode.SmartFunctions.Runtime.SmartFunctionEngine.Execute, Exception occurred during execution of
 SmartFunction SystemPoliciesSendEmail v(1), Exception:  --- Exception has been thrown by the target of an invocation.;Failure send
ing mail.;Unable to read data from the transport connection: net_io_connectionclosed. ---
Error   2025 Error Marshalling SourceCode.SmartFunctions.Runtime.SmartFunctionEngine.Execute, Exception occurred during execution of
 SmartFunction SystemPoliciesSendEmail v(1), Exception:  --- Exception has been thrown by the target of an invocation.;Failure send
ing mail.;Unable to read data from the transport connection: net_io_connectionclosed. ---
Error   8060 ProcessPacket Error, Exception occurred during execution of SmartFunction SystemPoliciesSendEmail v(1), Exception:  --
- Exception has been thrown by the target of an invocation.;Failure sending mail.;Unable to read data from the transport connection:
 net_io_connectionclosed. ---

K2Server HostA my control

SQLServer HostB my control

SMTP Server HostC not my control

Any idea where to correct this random occurrance?