I have a mail server on a private VPS (I used dovecot and postfix). Recently I had some issues with spamming and I had my server blocked because of that (it was used as an open relay for spamming by external users I guessed). I tried to fix the problem but I kind of broke my configuration. I can get messages now but can't send anymore. I'm a beginner in system administration so it's kind of hard for me and I need it to be fixed quickly. I'm looking for someone who can fix my postfix configuration. And adding some security on it would be a plus. I'm on a Debian 7. Thank you!