Здравствуйте! Почему-то при при попытке отправить письмо возникает ошибка:
root@server:/etc/postfix# echo "message" | mailx -s "subject" test1@mailserver.ru
send-mail: fatal: /etc/postfix/main.cf, line 50: missing '=' after attribute name: "$virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps "
Can't send mail: sendmail process failed with error code 75
root@server:/etc/postfix# echo "message" | mailx -s "subject" test1@mailserver.ru
send-mail: fatal: /etc/postfix/main.cf, line 50: missing '=' after attribute name: "$relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps "
Can't send mail: sendmail process failed with error code 75
Строки из /etc/postfix/main.cf (49-51)
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 $virtual_mailbox_limit_maps
ОС: Ubuntu Server 16.04 x64
В чём может быть проблема?