[subhobroto]

> Indeed. And re the image fingerprinting, it just checks the file names of "message parts", not content-type or content-disposition (even though imapflow exposes those)

Thank You for the explanation. This sheds some light on why the OP kept saying this tool works only on GMail while also saying this is IMAP based. An IMAP solution should be mostly provider agnostic but because of all of this GMail filter business, it's not.