SharePoint 2013 Designer workflow 500 Error in Send mail Activity

Error: RequestorId: 1ca8de59-3d62-782a-0000-000000000000. Details: RequestorId: 1ca8de59-3d62-782a-0000-000000000000. Details: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.ApplicationException: HTTP 500 {"Transfer-Encoding":["chunked"],"X-SharePointHealthScore":["0"],"SPClientServiceRequestDuration":["1073"],"SPRequestGuid":["1ca8de59-3d62-782a-b382-5cad0b97cc22"],"request-id":["1ca8de59-3d62-782a-b382-5cad0b97cc22"],"X-FRAME-OPTIONS":["SAMEORIGIN"],"MicrosoftSharePointTeamServices":["15.0.0.4420"],"X-Content-Type-Options":["nosniff"],"X-MS-InvokeApp":["1; RequireReadOnly"],"Cache-Control":["max-age=0, private"],"Date":["Thu, 27 Feb 2014 06:03:49 GMT"],"Server":["Microsoft-IIS\/8.0"],"X-AspNet-Version":["4.0.30319"],"X-Powered-By":["ASP.NET"]} at Microsoft.Activities.Hosting.Runtime.Subroutine.SubroutineChild.Execute(CodeActivityContext context) at System.Activities.CodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)

Error Code: 500


This error because the SMTP server is off. This kind of problem normally occurs when we restart the IIS.

Solution: Start the SMTP server and to rectify the problem in the Future make sure the Simple Mail Transfer Protocol(SMTP) service is set to start automatic. For doing that go to Services.msc and find out the SMTP service and make it automatic.