Can Spammers get your email address if it's set as postmaster, webmaster, etc?
When you set-up a "postmaster" email in postfix/cyrus/dovecot/fetchmail, etc, or a web-master address in an apache vhost, can spammer's query your server and get that information? Or is it only for internal use by the system?
Solution 1:
Spammers send mail to common addresses at every domain they can. They don't need to find that you've set it up.
Solution 2:
Spammers don't query for that address, it is specified by RFC as needing to exist (along with webmaster, hostmaster, etc) so they just blindly send to it. And no it is not for internal use only.