Sorry for the inconvenience you are facing.
I was able to reproduce this issue at my end using the latest version of Aspose.Email for .NET 2.6.0 and following code.
MailMessage mailMsg = MailMessage.Load(“Inbox_001110.eml”);
We are already investigating the issue of supported encodings by Aspose.Email. Meanwhile, you can load this EML file by skipping the validity checking as follow:
MailMessage mailMsg = MailMessage.Load(“Inbox_001110.eml”, FileCompatibilityMode.SkipValidityChecking);
I have also logged this issue in our bug tracking system as NETWORKNET-33638, so that it can be made part of investigations and resolved. I have linked this thread with the logged issue so that you be notified automatically once the fix is available.