When I tried to run the DatabaseMail.exe manually in Windows event log I face with the following error message:

Exception Type: Microsoft.SqlServer.Management.SqlIMail.Server.Common.BaseException

Message: There was an error on the connection. Reason: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server), connection parameters: Server Name: ., Database Name: msdb