need help with postfix and network email
i setuped a mailsrerver with postfix. i fetch emails fetchmail, get
them to the clients pc with qpopper and relay them with postfix.
i am on dialup and my nonexisting domain (workgroup) is
"atomstrahl.farm", while the real domain where i fetch(mail) my mails from
is "atomstrahl.de". i setuped a sender_canonical to have the real
domain in the email-header, the problem i have now is when i send the
an email to my romeneighbor i have to use as the email adress
firstname.lastname@example.org (the unreal one) if i use the real
email@example.com it will relayed to the smtp-server in the
basically how can i prevent that emails for local users gets over
the internet without using the faked email adress?
thanks in advance