There are, in fact, non-frivolous DKIM issues, such as DKIM selectors for which the private key is available or can be cracked. Historically, 512 bit RSA was s

There are, in fact, non-frivolous DKIM issues, such as DKIM selectors for which the private key is available or can be cracked. Historically, 512 bit RSA was somewhat common, and old selectors don't always get removed.