postfix won't recieve mails from other than my server!
While setting up my first mail server with postfix, I ran into a very unusual problem (at least for me)
Users on my computer can send and recieve mails from each other. They can even send mails to other adresses. At first I would have mails returned when I try to send a mail, say from my Yahoo account, to a users on my server. But I had that fixed and now I do not have any messages for undelivered mails, but I do not recieve then on my server. Is it a problem of DNSs not yet updated around the world? Or is there another possible problem?