Filtering out email addresses with pipe symbol

[Charles Leeds]

Qmail Gurus,

We were audited and one of the findings was that our qmail server allowed
addresses with the pipe symbol in them, which was reported in our audit as a
bad practice.

Is there any way to block email addresses (sender or recipient) with the
pipe symbol in them via configuration files, or would I have to patch the
code?

Thanks,
Fox
[EMAIL PROTECTED]