Emails without a subject

This message came through one of the mailing lists I read.

Hi,

This is an automatic reply. My mailbox does not accept messages without a Subject. Your email did not appear to contain a Subject and was automatically deleted. Please re-send it with a meaningful subject and I will receive your message and respond.

Thank you!

While the fact that it went to the list is indicative of a rather broken auto-responder system, I thought the message itself was funny and maybe even a useful thing to do in certain limited cases. Although it might be most appropriate for subjects that consist of things like "read this" or "important" rather than blank.