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To use the postfix relay function, modify your /etc/postfix/main.cf file to include the following configuration: queue_directory = /var/spool/postfix command_directory = /usr/sbin daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix mail_owner = postfix mydomain = domain.com myorigin = $myhostname inet_interfaces = localhost ...


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The "mail" command will try to run /usr/sbin/sendmail locally to deliver the email message. "mail" is a MUA (Mail User Agent), while sendmail is a MTA (Mail Transport Agent). If you want "mail" to deliver to a fixed relay, you can either install sendmail and configure that to do what you want, or alternatively install "ssmtp" which is specifically designed ...


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It is the receiving MTA that is rejecting the non-existent sender; there is nothing that you can do about that on your end about that (besides simply using a real sender). I also reject envelope senders that do not exist, as that means that NDRs also can't be delivered to the sender, and in 99.5% of the cases a non-existent envelope sender is spam or ...



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