Exim4 Integration

To have Exim4 use the greylisting daemon you will most likely want to add a "defer" rule to your SMTP RCPT command ACL just before your "accept" rule for local domains, e.g.

  defer   message       = Greylisting in effect, please try again later.
          log_message   = greylisted.
          domains       = +local_domains : +relay_to_domains
          !senders      = : postmaster@*
          !hosts        = +relay_from_hosts
          !authenticated = *
          condition     = ${if eq {${readsocket{/var/run/greylstd/greylstd.sock}{check $sender_host_address $sender_address $local_part@$domain\n}{5s}{}{}}}{defer}{true}{false}}