No SPAM-filter is perfect, because the decision has to be based on multiple factors. The effectiveness is about 90%. This justifies the use of the SPAM-filter.
Immediately delete SPAM and never reply.
Do not click on SPAM-mails, do not forward SPAM-mails, do not call any numbers specified in SPAM-mails, do not buy anything from SPAM-mails.
You can report SPAM by appending and sending it to spam@oth-aw.de.
Please do use common sense.