Sample code for 30+ languages & platforms
Chilkat2-Python

Attach a File with an Explicit Content Type

See more Email Object Examples

Demonstrates the Chilkat Email.AddFileAttachment2 method, which attaches a file from the filesystem and lets you explicitly specify its content type rather than having Chilkat infer it from the file extension. This example attaches a binary file as application/octet-stream.

Background: Extension-based type detection is convenient but not always right — a file may have an unusual or missing extension, or you may need a very specific MIME type for the recipient to process it correctly. Specifying the content type explicitly removes the guesswork. application/octet-stream is the generic "arbitrary binary data" type, a safe default that tells the client to treat the attachment as an opaque download rather than trying to render it.

Chilkat Chilkat2-Python Downloads

Chilkat2-Python
import sys
import chilkat2

success = False

# Demonstrates the AddFileAttachment2 method, which attaches a file and lets you
# explicitly specify its content type instead of letting Chilkat infer it.

email = chilkat2.Email()
email.Subject = "Email with a file attachment"
email.Body = "Please see the attached file."

# Attach a file, explicitly specifying the content type.
success = email.AddFileAttachment2("qa_data/attachments/data.bin","application/octet-stream")
if (success == False):
    print(email.LastErrorText)
    sys.exit()

print("NumAttachments = " + str(email.NumAttachments))

# Note: The path "qa_data/attachments/data.bin" is a relative local filesystem path,
# relative to the current working directory of the running application.