Email Router Error

#26234 - The E-mail Router service could not process a provider work item using assembly: Microsoft.Crm.Tools.EmailProviders.dll and class: Microsoft.Crm.Tools.Email.Providers.SmtpPollingSendEmailProvider. System.Configuration.ConfigurationErrorsException: The organization name in the URL is not valid. To determine the organization name, start the Microsoft Dynamics CRM Web application as a user who has the System Customizer role. Click Settings, and then click Customizations. On the Customizations page, click Developer Resources. The organization name is displayed next to the "Organization Unique Name" label.

Server stack trace:

   at Microsoft.Crm.Tools.Email.Providers.OrganizationUrlCache.FindOrganization(String organizationName, OrganizationDetailCollection organizationDetails)

   at Microsoft.Crm.Tools.Email.Providers.OrganizationUrlCache.DiscoverOrganizationUrl(Uri discoveryServiceUrl, Credential credentials, String organizationName)

   at System.Lazy`1.CreateValue()

Exception rethrown at [0]:

   at Microsoft.Crm.Tools.Email.Providers.OrganizationUrlCache.FindOrganization(String organizationName, OrganizationDetailCollection organizationDetails)

   at Microsoft.Crm.Tools.Email.Providers.OrganizationUrlCache.DiscoverOrganizationUrl(Uri discoveryServiceUrl, Credential credentials, String organizationName)

   at System.Lazy`1.CreateValue()

   at System.Lazy`1.LazyInitValue()

   at Microsoft.Crm.Tools.Email.Providers.OrganizationUrlCache.GetOrganizationUrl(Uri discoveryServiceUrl, Credential credentials, String organizationName)

   at Microsoft.Crm.Tools.Email.Providers.Utility.GetCrmService(Uri discoveryUri, String authMode, String userName, String password)

   at Microsoft.Crm.Tools.Email.Providers.CrmPollingSendEmailProvider.Run()

   at Microsoft.Crm.Tools.Email.Agent.ServiceCore.ExecuteProviderWork(Object providerQueueRequestObject)

Any ideas on what could be causing the issue?