There is a header called "content-disposition" that the outlook uses to inform how an attachment should be displayed.
It's either inline or attachment. This makes a signature with an image not show as an attachment for example, but as part of the message.
If you send a real attachment image the "content-disposition" is marked as "attachment"
I'm trying to use this header to tell ESA to encrypt messages with an actual image attached, but not if the image is only on the signature.
I know the users could put an image "inline" that's not a signature but I'm not worried about it. All I want is to mach a content that's part of the email and ESA won't let me.
I tried using the criteria: "Header other" and ESA won't mach the rule if the header is "content-disposition", even when I try to match with "header exists"
I tried matching with body and attachment content, then matching "content-disposition: attachment:"
I tried matching the body only, the attachment. Nothing makes ESA fire the rule.
If I match the the body for the word "attachment" (that's right afer the "header", the rule fires) - I uploaded a file showing this.
I also attached the text that goes on the "data" portion of the email.
Any help is much appreciated. - You can try to replicate the issue copying the text file into your "data" portion and trying to match "content-disposition" in any way.
Thank you!
