Following this tutorial i have successfully installed Postfix on my server, but for some reason, i cannot send e-mails from other servers. I can send e-mails to other users inside my server like firstname.lastname@example.org, and i can also receive e-mails from Gmail, and Hotmail, but when i try to send e-mail to those sites, nothing happens. Do i need any extra configuration on Postfix to be able to send e-mails to others?
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