What are the common MIME content types used in email attachments?
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Updated 30 May 2025
In email attachments, MIME content types (also known as media types) describe the nature of the file being attached. These help email clients understand how to display or handle the file.
Common MIME Content Types for Email Attachments
text/plain.txt)text/htmlapplication/pdfapplication/msword.docapplication/vnd.openxmlformats-officedocument.wordprocessingml.document.docxapplication/vnd.ms-excel.xlsapplication/vnd.openxmlformats-officedocument.spreadsheetml.sheet.xlsximage/jpegimage/pngimage/gifapplication/zip.zipfileapplication/jsontext/csvaudio/mpegvideo/mp4How to Set MIME Type in C# Attachments
When adding attachments in C#, the MIME type is usually inferred from the file extension. But you can explicitly set it:
Or if reading from a stream: