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Digitally Signed Emails

We are using "EWSClient.GetEWSClient" to connect to office 365 and access mails.

and using below code to fecth and save single message.

var msg = client.FetchMessage(mid);

msg.Save(stream, Aspose.Email.Mail.SaveOptions.DefaultMsgUnicode);

It works fine and allows to open normal mail in MS Outlook. but when mail is with trusted digital signature, opening the file gives this message : "Cannot start Microsoft outlook. An error occurred underlying security system."

Does it require to save MSG file in different way to work properly?

Hi Satish,

Thank you for contacting Aspose Support team.

We have tested this issue at our end and downloaded the MSG from our account that opens fine in MS Outlook at our end. Can you please make sure that you are using the latest version of the API i.e. Aspose.Email for .NET 6.3.0 as there were some issues fixed related to Digitally Signed Messages in this version. If the issue still persists, please share your sample MSG file with us that we can use to investigate the issue further at our end.