Hi,
Thank you for your interest in Syncfusion products.
Please try using IMIMEDocument to handle the MIME content as shown below.
IMIMEDocument docum = MIMEDocument.Parse("t19.eml");
this.richTextBox1.AppendText(" Data : " + docum.Header.ContentType.Name);
Refer the sample from following link.
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=MIMETestSample1355800253.zipPlease let me know if you have any queries.
Regards,
Lingaraj S,