Both options are possible. It is easier if you throw the samples in a postbox. The samples are stable between -4 ° C and + 30 ° C for at least one week. Samples should not be exposed to temperatures exceeding these values for a long time. If these temperatures are exceeded, please drop the sample at the post office. If you live in Austria, please bring the sample directly to the post office. It is not possible to deliver the sample to your postbox.