CRM 2016 cannot access user GMAIL inbox but can send out emails
Email router tests show success
Email router and CRM are on the same server
GMail pop and smtp used
Problem: There is no incoming mail to all user mailboxes. Event log display the following consistent error for all users.
Microsoft.Crm.Tools.Email.Providers.EmailException: An error occurred while executing POP3 command "<Command removed for security reasons>". The server response was: "-ERR [SYS/TEMP] Temporary system problem. Please try again later. a21mb199169172edd".
at Microsoft.Crm.Tools.Email.Providers.Pop3Client.ValidateLine(String receivedLine, String command, Boolean hideCommand)
at Microsoft.Crm.Tools.Email.Providers.Pop3Client.ReadDataWithEncoding(StreamReader streamReader, String command, Boolean singleCommand, Boolean skipValidation, Boolean hideCommand)
at Microsoft.Crm.Tools.Email.Providers.Pop3Client.ReceiveData(String command, Boolean singleCommand, Boolean skipValidation, Boolean hideCommand, String& encodingCharset)
at Microsoft.Crm.Tools.Email.Providers.Pop3Client.SendPasswordCommand(String password)
at Microsoft.Crm.Tools.Email.Providers.Pop3Client.AuthenticateClearText(String userName, String password)
at Microsoft.Crm.Tools.Email.Providers.Pop3PollingMailboxProvider.OpenMailbox()
at Microsoft.Crm.Tools.Email.Providers.CrmPollingMailboxProvider.Run()