Question
I searched the email archive with the filter "Has Attachment: True," but the attachment filenames do not appear in the email details. Additionally, in the CSV file from the Header Download, has_attachment is TRUE, but attachment_filenames is blank. Why is this happening?
Answer
This occurs when the system detects an attachment, but the email data does not include a specific "filename."
The Cause:
This is typically caused by the email client used to create the message. For example, when images are embedded directly into an HTML email using CIDs (Content-IDs), the system counts them as attachments. However, since these embedded images often lack a standard filename, the field remains empty.
How to check the files:
If you need to verify the attachment details, please download the original email message to view the full content and embedded files.