SMTP Error: The SMTP host was not specified. Rasmus Jensen June 25, 2019 09:02 ReasonThe server was not entered in SMTP Settings SolutionCheck that you have entered a valid SMTP Server in SMTP Settings Related articles Tip: How to use the user email for the SMTP sending Exchange Error: The request failed. The remote server returned an error: (401) Unauthorized / The request failed. The remote server returned an error: (404) Not Found SMTP Error: SendAsDeniedException.MapiExceptionSendAsDenied SMTP Error: Failure sending mail Exchange Error: Microsoft.Exchange.WebServices.Data.ServiceRequestException