Hi Paul,
After not getting the error for 3 times opening eM, I got this error and log.

With the log file:
4:22:01 PM Online state: changed to online with reason NetworkAvailability
4:22:01 PM shellysbracken@aol.com [IMAP] Synchronizing subfolders: For foldershellysbracken@aol.com/
4:22:01 PM shellysbracken@aol.com [CalDAV] MailExceptions.ConnectionException: The remote name could not be resolved: ‘caldav.icloud.com’ —> System.Net.WebException: The remote name could not be resolved: ‘caldav.icloud.com’
4:22:01 PM at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
4:22:01 PM at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult)
4:22:01 PM at MailClient.CalDav.ProtocolCommands.RequestCommand.Execute(HttpWebRequest httpRequest, CancellationToken cancellationToken, Action`1 logBody)
4:22:01 PM at MailClient.CalDav.ProtocolCommands.XmlRequestCommand.Execute(HttpWebRequest httpRequest, CancellationToken cancellationToken, Action`1 logBody)
4:22:01 PM at MailClient.CalDav.ProtocolCommands.Connector.RunCommand(CalDavAccount account, ICommand command, CancellationToken cancellationToken)
4:22:01 PM — End of inner exception stack trace —
4:22:01 PM at MailClient.CalDav.ProtocolCommands.Connector.RunCommand(CalDavAccount account, ICommand command, CancellationToken cancellationToken)
4:22:01 PM at MailClient.CalDav.Synchronizer.BootstrapCommand.UpdatePrincipalProperties(Uri baseUri, Boolean retryOnNotFound)
4:22:01 PM at MailClient.CalDav.Synchronizer.BootstrapCommand.Execute(WorkerStatus status)
4:22:01 PM at MailClient.Commands.Command.Process(WorkerStatus status)
4:22:02 PM shellysbracken@aol.com [CardDAV] Synchronizing subfolders: For foldershellysbracken@aol.com/
4:22:02 PM shellysbracken@aol.com [CardDAV] Synchronizing subfolders: Done
4:22:02 PM shellysbracken@aol.com [IMAP] Synchronizing subfolders: Done
4:22:02 PM shellysbracken@aol.com [IMAP] Synchronizing subfolders: For foldershellysbracken@aol.com/Saved
4:22:02 PM shellysbracken@aol.com [IMAP] Synchronizing subfolders: Done
4:22:02 PM shellysbracken@aol.com [IMAP] Synchronizing messages: For foldershellysbracken@aol.com/Inbox
4:22:02 PM shellysbracken@aol.com [IMAP] Synchronizing messages: Done
Question: My iCloud login uses my AOL email address but that is not my iCloud email address (which I didn’t activate on eM). Would this have something to do with the errors?