Exm error "Could not fetch list of email clients"

Question

Sitecore.NET 8.2 update 7. EXM 3.5. We use custom smtp. This errors have no effects for sending. Could I off it?

Message: The request failed with HTTP status 403: Forbidden.
Source: System.Web.ServicesLog:at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
       at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
       at Sitecore.Modules.EmailCampaign.EmailPreviewService.EmailPreview.GetEmailClients(Credentials credentials)
       at EmailCampaign.Controls.EmailPreviewClientDataSource.EmailPreviewClientDataSource.GetEmailClients()

ERROR Could not fetch list of spam check clients
Exception: System.Net.WebException
Message: The request failed with HTTP status 403: Forbidden.
Source: System.Web.Services
       at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
       at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
       at Sitecore.Modules.EmailCampaign.SpamCheckService.SpamCheck.GetSpamClients(Credentials credentials)
       at EmailCampaign.Controls.SpamCheckClientDataSource.SpamCheckClientDataSource.GetSpamCheckClients()

Answer 1

You can ignore those exceptions.

The email preview and spam check functionality has been deprecated.

On February 28, 2018, Sitecore will turn off the Email Preview and Spam Check services. The reason for this is that Litmus has decided to deprecate their legacy API, which we currently use as a part of Sitecore Email Experience Manager (EXM) Email Preview and Spam Check services.

Litmus is retiring their API in 2018 because they have a new product offering. The new product does not allow an OEM integration, so it is not a viable part of our partnership. Customers can utilize the new service but must sign up with Litmus directly.

from End of life for Email Preview and Spam Check (Litmus) services