>>> "GA" == 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.

Right, gnus reject to send such messages.
I can either put in the To field

    1. undisclosed-recipients <myemail@gmail.com>

    2. Or as Eric suggested leave it blank, which is probably better. 
       But I cannot do:

    3. To undisclosed-recipients; that gets rejected by gnus.



> 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 would really like to know, I have the feeling it is some mailing list
software.