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
- 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.