The attached zip contains an email containing a VCalendar as the body that throws and exception with an inner exception of “STANDARD” when loaded. If I remove the BEGIN: STANDARD through the END: STANDARD, the email will load without error. I am using VS 2019 and .NET 4.0. I have downloaded and tested with version 220.127.116.11 of Aspose.Email.
Aspose_VCardStandard_02132020.zip (4.1 MB)
I have worked with sample project shared by you and have been able to observe the issue. An issue with ID EMAILNET-39735 has been created in our issue tracking system to further investigate and resolve the issue. This thread has been linked with the issue so that you may be notified once the issue will be fixed.
The issues you have found earlier (filed as EMAILNET-39735) have been fixed in this update.