There was a case recently where the sender should not have used the
To: header. It was an e-mail to participants in a medical study.
Unfortunately, the recipients were in the envelope and the To: header,
revealing their identity in an embarassing and illegal fashion.

You may personally choose to block such e-mails, doing it for all your
users may not be doing them any favors.

Just my 2 currency units,
  Jeffrey

Quoting Will Yardley <postfixlifewithoutqmail.org>:
> Ralf Hildebrandt wrote:
> > On Thu, Jan 03, 2002 at 05:16:32PM +0800, d w e n wrote:
> >
> > > or how they were sent if thres no To: or Cc: in the mail's header.
> >
> > % echo test | sendmail dwenacacia.accessway.ph
>
> or a message may have been sent with all the recipients specified via
> bcc; i've seen this a lot if the sender uses bcc and doesn't add a 'To'
> line.
>
> w
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		 -- Johnny Paycheck
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