[Wiki Loves Monuments] Warn people without mail address -> bot ?

[Sylvain Machefert]

Hello all,
I've found that some participants haven't yet entered their mail address in
their preferences. It's required if french competitions rules (and I think
in many others) so that we can contact the winners.

Is there any botmaster there that could do something to leave an automatic
message on participants talkpage to warn them ?

Thanks
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