Configure Postfix Mail Server CentOS/RedHat
Set up Postfix on CentOS/RHEL as an internal mailhub and outbound gateway: inet_interfaces, mynetworks, STARTTLS with a self-signed cert, and testing.
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Configure Postfix RelayHost CentOS/RedHat
Send all mail from a CentOS/RHEL server through your internal mail server with the Postfix relayhost setting, then test with mailx, mailq and the maillog.
Postfix and Dovecot Cheat Sheet for RHEL, AlmaLinux and Rocky Linux
Postfix and Dovecot command cheat sheet for RHEL, AlmaLinux, Rocky Linux, Oracle Linux and CentOS Stream: postconf, queue management, lmdb tables, logs, TLS testing, doveadm, firewalld and SELinux.
Configure Postfix and Dovecot on RHEL, AlmaLinux, Rocky and Oracle Linux
Step-by-step Postfix and Dovecot mail server setup for RHEL 9/10, AlmaLinux, Rocky Linux, Oracle Linux and CentOS Stream: TLS, SASL submission on 587, IMAPS, LMTP delivery, verification and troubleshooting.