On Thu, 14 Feb 2008 11:12:02 -0500 Joseph Brennan <brennan@xxxxxxxxxxxx> wrote: > > > Situation: an old user has a mail in his account, that was sent _only_ to > > bcc: People, so in "to:" you will only find "<undisclosed recipients>". > > Check what is really in the message. Some mail programs display the > null address in modified form. > > This is valid: To: undisclosed recipients :; > This is not: To: <undisclosed recipients> > I would say that the former is not actually valid, though the syntax looks correct. RFC2822 section 3.6.3 says that To:, Cc: and Bcc: must contain at least one address. The above does not contain an address. None of the three is required, so if there is to be no recipient address in the header, the To: and Cc: lines should be absent. (If I remember correctly, RFC822 did require either To: or Cc: to be present.) Phil. --------------------------------------- Phil Chambers (postmaster@xxxxxxxxxxxx) University of Exeter ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
