H=some-relay.my-isp.example.org [a.b.c.d] X=TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128 CV=no F=<anywhere-else@example.org> rejected RCPT <server@example.com>: Unrouteable address

#####################################################
### router/299_exim4-config_dovecot_router
#####################################################

### router/299_exim4-config_dovecot_router
#################################

# This router delivers mail to any dovecot virtual
# user who has a directory under /home/$domain/mail
# Place after remote router and before localuser router
# + addressing support requires uncommenting
dovecot_router:
  driver = accept
  #local_part_suffix = +*
  #local_part_suffix_optional
  require_files = +/home/$domain/mail/$local_part/
  transport = dovecot_transport

#####################################################
### end router/299_exim4-config_dovecot_router
#####################################################

#####################################################
### transport/40_exim4-config_dovecot_transport
#####################################################

# Transport to send any mail for virtual dovecot users to correct maildir box
dovecot_transport:
  debug_print = "T: dovecot_virtual appendfile for $local_part@$domain"
  driver = appendfile
  create_directory
  directory_mode = 0750
  directory = /home/$domain/mail/$local_part
  maildir_format = true
  delivery_date_add
  envelope_to_add
  return_path_add
  user = $domain
  group = $domain
  mode = 0640
  mode_fail_narrower = false

#####################################################
### end transport/40_exim4-config_dovecot_transport
#####################################################

# Authenticate against Dovecot
dovecot_plain:
  driver = dovecot
  public_name = PLAIN
  server_socket = /var/run/dovecot/auth-client
  server_set_id = $auth1

dovecot_login:
  driver = dovecot
  public_name = LOGIN
  server_socket = /var/run/dovecot/auth-client
  server_set_id = $auth1

# exim -bt server@example.com
server@example.com
  router = dovecot_router, transport = dovecot_transport

# exim -bt server@example.com
R: smarthost for server@example.com
server@example.com
  router = smarthost, transport = remote_smtp_smarthost
  host mailhost.my-isp.example.org [a.b.c.d] port=587
  host mailhost.my-isp.example.org [a.b.c.e] port=587