2822 To: header (was Re: [ietf-dkim] Mailing lists as 2822-Sender)2007-12-05 15:22:19Hector Santos wrote: in the same vain many SMTP receivers will fill in the missing 822 required fields. FROM: <<-- x821.MailFrom To: <<-- x821.RcptTo The latter should never be done. If there's a missing To: header, an SMTP receiver should synthesize: To: undisclosed-recipients; Otherwise, you risk exposing Bcc: addresses. (I suppose it's safe for the MDA to add a To: header upon final delivery to one and only one recipient.) Regards, David.
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