posteo drawback:   I have been using for several years so far, and it seems to be OK. But now I found out that there is no way of deleting spam already appeared in your posteo email account without entering the spam email itself:   1) their filters don't work backwards. So you can only ban persistent spammer from sending you new emails. It's far from been safe and sound   2) there is no tick boxes to delete the email without opening it (like almost all secure providers have to boost th