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Originally Posted by n2s
However, what is about the possibility to send mails without using authentication  ? How could I prevent that? |
Just to find out why your server doesn't require authentication:
- Do you send directly from the server?
- Do you send from within a network which is specified in
mynetworks in /etc/postfix/main.cf?
- Do you send to a recipient who's on the server?
In all these cases you don't need to authenticate. You only need to authenticate if you want to send a mail from a remote PC to a recipient who's not on your server.