Fix typo in postfix-out config

roles/mail/templates/postfix-out/main.cf

@@ -39,7 +39,7 @@ smtpd_timeout = 1200s
 # "smtp" transport for outbound mail (bounces, ...). The latter
 # won't starve the former of delivery agent slots.
 relay_domains = ${indexed}domains cdb:/etc/postfix/domains-auto
-relay_recipient_maps = ${ldap}recipients $${indexed}transport {indexed}mailman_transport
+relay_recipient_maps = ${ldap}recipients ${indexed}transport ${indexed}mailman_transport
 relay_destination_recipient_limit = 1
 
 # Send each message to its target backend.