On 2017-02-07 18:33, Ruga wrote: > I follow the actual RFC standard, not the proposed revisions. The To > From and Cc fields are defined by a grammar AND a natural language > description. Such fields MUST hold addresses, were an address is a > username the "@" symbol and a domain name. The string "undisclosed > recipients: ;" does not parse the grammar, and it does not pass the > natural language requirement for an address. If the sender hides the > recipients, why should I care delivering its junk to my valued > accounts?
FWIW, I regularly get completely legitimate non-commercial messages with headers of this form. People use it to conceal from each recipient the addresses of other recipients - just like a list or an alias, but (I'm guessing) done entirely in the senders MUA. -- Please *no* private Cc: on mailing lists and newsgroups Personal signed mail: please _encrypt_ and sign Don't clear-text sign: http://cr.yp.to/smtp/8bitmime.html
