Cita: ¿Porqué no publicas el archivo de configuración completo?
Es que tiene casi 20 hojas. Pongo las primeras líneas, donde hace referencia a esa opción por la que pregunto:
#########
# WARNING WARNING WARNING
# WARNING WARNING WARNING
# WARNING WARNING WARNING
# WARNING WARNING WARNING
# WARNING WARNING WARNING
# This file is generated dynamically from the files in
# the conf.d/ directory, or from exim4.conf.template respectively.
# Additional information is read from update-exim4.conf.conf
# This version of the file was created from the directory /etc/exim4
# Any changes you make here will be lost.
# See /usr/share/doc/exim4-base/README.Debian.gz and update-exim4.conf(8)
# for instructions of customization.
# WARNING WARNING WARNING
# WARNING WARNING WARNING
# WARNING WARNING WARNING
# WARNING WARNING WARNING
# WARNING WARNING WARNING
#########
exim_path = /usr/sbin/exim4
.ifndef CONFDIR
CONFDIR = /etc/exim4
.endif
UPEX4CmacrosUPEX4C = 1
##############################################
# the following macro definitions were created
# dynamically by /usr/sbin/update-exim4.conf
.ifndef MAIN_LOCAL_INTERFACES
MAIN_LOCAL_INTERFACES=127.0.0.1
.endif
.ifndef DC_minimaldns
DC_minimaldns=1
.endif
.ifndef MAIN_HARDCODE_PRIMARY_HOSTNAME
MAIN_HARDCODE_PRIMARY_HOSTNAME=uno.dominio.org
.endif
.ifndef MAIN_PACKAGE_VERSION
MAIN_PACKAGE_VERSION=4.69-2
.endif
.ifndef MAIN_LOCAL_DOMAINS
MAIN_LOCAL_DOMAINS=@:localhost:uno
.endif
.ifndef MAIN_RELAY_TO_DOMAINS
MAIN_RELAY_TO_DOMAINS=empty
.endif
.ifndef ETC_MAILNAME
ETC_MAILNAME=uno.dominio.org
.endif
.ifndef LOCAL_DELIVERY
LOCAL_DELIVERY=mail_spool
.endif
.ifndef MAIN_RELAY_NETS
MAIN_RELAY_NETS=: 127.0.0.1 : ::::1
.endif
.ifndef DCreadhost
DCreadhost=empty
.endif
.ifndef DCsmarthost
DCsmarthost=192.168.20.115
.endif
.ifndef DC_eximconfig_configtype
DC_eximconfig_configtype=smarthost
.endif
.ifndef DCconfig_smarthost
DCconfig_smarthost=1
.endif
##############################################
domainlist local_domains = MAIN_LOCAL_DOMAINS
domainlist relay_to_domains = MAIN_RELAY_TO_DOMAINS
hostlist relay_from_hosts = MAIN_RELAY_NETS
.ifndef MAIN_PRIMARY_HOSTNAME_AS_QUALIFY_DOMAIN
.ifndef MAIN_QUALIFY_DOMAIN
qualify_domain = ETC_MAILNAME
.else
qualify_domain = MAIN_QUALIFY_DOMAIN
.endif
.endif
.ifdef MAIN_LOCAL_INTERFACES
local_interfaces = MAIN_LOCAL_INTERFACES
.endif
.ifndef LOCAL_DELIVERY
LOCAL_DELIVERY=mail_spool
.endif
gecos_pattern = ^([^,:]*)
gecos_name = $1
.ifndef CHECK_RCPT_LOCAL_LOCALPARTS
CHECK_RCPT_LOCAL_LOCALPARTS = ^[.] : ^.*[@%!/|`#&?]
.endif
.ifndef CHECK_RCPT_REMOTE_LOCALPARTS
CHECK_RCPT_REMOTE_LOCALPARTS = ^[./|] : ^.*[@%!`#&?] : ^.*/\\.\\./
.endif
.ifndef MAIN_LOG_SELECTOR
.......................etc.........etc...........e tc...........
Saludos!!