Hi, i have some problems with spammers and i would like to ask how to set postfix to validate sender email addresses only for our domains. Is there some way to do this?
Other thing that i want to ask. I have this problem: i connect thru telnet to the smtp server and send email this way: helo myhostname.example.com mail from:[EMAIL PROTECTED] rcpt to:[EMAIL PROTECTED] data something here . quit mydomain.com is domain from the system. i'm able to send spam to this user, using the same email address in "mail from" field. Is there some way to protect my mailserver from this kind of things for our domains. If "mail from" use our domains (for example [EMAIL PROTECTED]), then to require authentication. In any case we use sasl and we require sasl authentication, but i see this problem. How to solve this?
