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Microsoft.Exchange.WebServices SendAndSaveCopy Error

I am using Microsoft.Exchange.WebServices from C# application to connects to Exchange server 2010 ,to send and receive emails.

when I am using  “SendAndSaveCopy” method to send emails out, occasionally I am getting following error.

One or more recipients are invalid.- Microsoft.Exchange.WebServices.Data.ServiceResponseException:
 One or more recipients are invalid.
   at Microsoft.Exchange.WebServices.Data.ServiceResponse.InternalThrowIfNecessary()
   at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest`1.Execute()
   at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalCreateItems(IEnumerable`1 items, FolderId parentFolderId, Nullable`1 messageDisposition, Nullable`1 sendInvitationsMode, ServiceErrorHandling errorHandling)
   at Microsoft.Exchange.WebServices.Data.Item.InternalCreate(FolderId parentFolderId, Nullable`1 messageDisposition, Nullable`1 sendInvitationsMode)
   at Microsoft.Exchange.WebServices.Data.EmailMessage.InternalSend(FolderId parentFolderId, MessageDisposition messageDisposition)
Please can anybody explain this

Thank you
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1 Solution
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Hope this can help .... also what .Net is the EWS using ?


- Rancy
capitaldevAuthor Commented:
.NET 4.0
capitaldevAuthor Commented:
I am using Web Services Managed API 1.1, on Windows 7  (32 bit)  and .NET framework 4.0

I am not getting this error all the time , it is happening only  around 2-5 % of out going emails.
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