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Postfix services often run in a "chroot" jail (a restricted environment) for security. If a service runs in chroot but the necessary device files (like /dev/null or /dev/log ) or libraries are missing inside the chroot directory (usually /var/spool/postfix ), the service will fail to start.

df -h /var/spool/postfix df -i /var/spool/postfix # Check inode usage dmesg | grep -i "error\|corrupt"

proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks