Email Router Configuration

Hello All,

I need how to resolve inconsistency in the dropping of mails on CRM and OWA. Gives this error in the logs:

#61042 - An error occurred while processing the outgoing e-mail message with subject "[HTN Ticket # 0020499] Acess code for LG2633 - Ticket Closed" for ExchangeOnline: crmserver for delivery through the exchange server.
Microsoft.Crm.Tools.Email.Providers.EmailException: Error: One or more recipients are invalid at Microsoft.Crm.Tools.Email.Providers.ExchangeOnlinePollingSendEmailProvider.LogEwsResponseErrorWarning(String message, ResponseClassType responseClassType)
   at Microsoft.Crm.Tools.Email.Providers.ExchangeOnlinePollingSendEmailProvider.ProcessMessageInternal(Entity emailMessage)
   at Microsoft.Crm.Tools.Email.Providers.CrmPollingSendEmailProvider.Run()