Issue with send mail anonymous vs oath2

when we create a mailmessage with embebbed images in the body and we send it using ‘anonymous/sandbox’ then the body is attached as html file

and when we send the same message using oauth then the body is correct

and if the body does not contain the embedded images then it is also send correctly

tried
version aspose mail .net 4.0 - 21.4.0.0
version aspose mail .net 4.0 - 22.2.0.0
possible the .net2 - 17.4.0.0 was correct

@MNI

Please create a standalone console application (source code without compilation errors) that helps us to reproduce your problem on our end and attach it here for testing. Please also share your sample test files. We will investigate the issue and provide you more information on it. Thanks for your cooperation.

i have been able to fix it using alternateview

@MNI

It is nice to hear from you that you have solved your issue. Please feel free to ask if you have any question about Aspose.Email, we will be happy to help you.