I have recently installed DotNetNuke Community Edition 5.6 to a MochaHost account through their available applications install.  The MochaHost people told me to set the SMTP Server to mail.<my domain>.com which I did in the Host Settings under SMTP Server Settings. When I click the Test link to the right it says that it has tested successfully.

I have tried SMTP Authentication on both Anonymous and NTLM  but whenever I do something where an email is sent automaticallly I get the following error

Error: is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Mailbox unavailable. The server response was: Authentication is required for relay ---> System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: Authentication is required for relay at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) at DotNetNuke.Services.Mail.Mail.SendEmail(String fromAddress, String senderAddress, String toAddress, String subject, String body) at DotNetNuke.Security.Roles.RoleController.SendNotification(UserInfo objUser, RoleInfo objRole, PortalSettings PortalSettings, UserRoleActions Action) at DotNetNuke.Security.Roles.RoleController.AddUserRole(UserInfo objUser, RoleInfo objRole, PortalSettings PortalSettings, DateTime effDate, DateTime expDate, Int32 userId, Boolean notifyUser) at DotNetNuke.Modules.Admin.Security.SecurityRoles.cmdAdd_Click(Object sender, EventArgs e) --- End of inner exception stack trace ---

 I'm guessing I missed a step somewhere but I'm frizzled if I know where. Can't find anything on Mochahost.