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If you neither get this message on your screen [nor one on your  provided e-mail,] then your browser settings are (probably) too strict/secure. Congratulations on that!
Consider lowering your settings for our webpage (temporarily) or use our pdf-form and send that to This email address is being protected from spambots. You need JavaScript enabled to view it. or to our postal address. Bytheway: Although there is a signature field in the pdf-form, you don't have to print it out and scan it only for that purpose, because under Swiss law a contract about joining an association does not require a signature.