I agree. Some sort of email saying that you have work to do would be nice.Aut Viam Inveniam Aut Faciam
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"normally" you should get a mail saying someone ordered one of your products that required customization.
Currently the only known issue is when "we" (Shapeways) orders something these mails are not send. To cope with this now I have asked all my colleagues to mail the model owner them selves if they order something... until this is fixed.
So if you didn't get a mail on a "non-Shapeways" order please let me know so I can handle this as a new bug.