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"Garreau, Alexandre" <galex-713@galex-713.eu> writes:

> I’d say use Bcc, which possibly won’t be replicated among bcc’ed
> people, while putting “undisclosed-recipients” in the To: fields. It
> will be bogus but your mail client/server will typically notice it
> itself.
>
> However putting “undisclosed recipients” in “To:” when there’s no
> mailing list address seems a common convention among spammers and some
> mail-listing software and features from mail clients (already received
> news from friends like this): do you know where do that come from?
> maybe to paliate the fact the “To” is mandatory according mail RFCs?
> Is there a RFC talking about “undisclosed recipients”?
>
> Because it is always that two words, sometimes with a dash, sometimes
> without, sometimes with semi-colon, sometimes not, etc.
>
> Any idea?

I always thought it was added automatically by a MTA somewhere if you
left the To: field blank. I don't think anyone types it in there manually.