I have 2 hub server in my exchange organisation.
I have configure 1 send connector in evry hub server to send email to Internet.
This send connector us DNS MX to route email.
I have configure a EHLO fqdn, this fqdn point to public adress used in my firewall.
i have only open smtp port 25 outgoing from my hub server.
Are this configuration is correct?
because now i am blacklisted in ips.backscatterer.org and i have 3 email domain refuse my email en send to my user reject message like this:
554 5.7.1 <n.commail@domai>: Relay access denied,
what i can do to resolve the problem??
I have many receive connector, one of them is open relay, i have add many IP adress to authorize them to send email. Its for printers, and many other applications, it user this smtp connector to send email without authentification.
may be when this email pass to internet in my send connector, it keep a trace of internal open relay?