Block send emails without authentication for added mailboxes on IspConfig 3 - Postfix !!!
Dear IspConfig Support,
I have latest version ISPconfig 3.0.4.5 working on my server, i have one problem urgently need to be resolved:
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When sending emails i expected no need to authenticate the sender, just need to know mailbox name and Postfix allow to send without login, password
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So everyone(include hackers or spammer) just neet to connect to smtp server using (mailbox which are in mailbox database, for example support@... .com, it's simple for them to guess (support mail sales mail) then they use to sent emails spamming e.g. makes your server became spamming mail server.
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Question is how to configure Postfix in Ispconfig 3 to block any outside connection to SMTP to send emails without Password (just know mailbox name)???
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I think is need to be guided by default in Perfect Setup How To... Because my server have a lot of connection like that, so currently i'm stop the postfix and waiting for help from U,,, i've try to reconfigure postfix/main.cf but no results, still can connect from outside with Outlook sent emails without authentication, system just compare mailbox name but no need to authenticate...
Thanks You a Lot !!!
Hoang Phuong, from Vietnam