> to (easy with e.g. Postfix header_checks):
> 
>       Require-TLS: NO
>       Subject: [insecure-delivery]: actual subject
> 
> or (not easy with header_checks, but hides the subject tag):
> 
>       Require-TLS: NO
>       Subject: actual subject

I think leaving [insecure-delivery] in the subject is a feature of
such a configuration, not a bug.  It conveys important information
about the delivery of the message.

Of course, someone could add the [insecure-delivery] to the
subject using an MTA that doesn't add Require-TLS, potentially
fooling someone, but I don't offhand see any serious security
consequences of being able to falsely claim your message
was delivered insecurely, when it wasn't.

-Tim

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