Hi Pierre,
Thank you for contacting Aspose support.
This issue arose a few days back where the From field contained a “.” in the address and is logged in our issue tracking system as NETWORKNET-33519. The issue is in queue for further investigation by our development team and is planned for Aspose.Email for .NET 2.5.0 release (due by the end of December 2012).
Can you please tell us if you are facing the same issue? If yes, I would request you to please provide us with the sample email file, so that we can investigate this issue and provide you with further assistance.