Доставка почты на локальном компьютере

Имеется отдельный "домашний" компьютер. Не могу отправить локальную почту, т. е.
%mail lupo
Subject: Test
It's only test message.
.
Cc: test
send-mail: Cannot open ha0s-laptop:25
Can't send mail: sendmail process failed with error code 1
Установлены следующие пакеты, на мой взгляд, имеющие отношение к отправке почты:
mailx-8.1.2.20050715-r1
mailx-support-20060102-r1
ssmtp-2.61-r2

Настройки:
cat /etc/mail/mailer.conf
# Execute the "real" sendmail program from ssmtp,
# named /usr/sbin/ssmtp
#
sendmail /usr/sbin/ssmtp
send-mail /usr/sbin/ssmtp
mailq /usr/sbin/ssmtp
newaliases /usr/sbin/ssmtp
###
###
#cat /etc/ssmtp/ssmtp.conf
#
# /etc/ssmtp.conf -- a config file for sSMTP sendmail.
#
# The person who gets all mail for userids < 1000
# Make this empty to disable rewriting.
root=postmaster
# The place where the mail goes. The actual machine name is required
# no MX records are consulted. Commonly mailhosts are named mail.domain.com
# The example will fit if you are in domain.com and your mailhub is so named.
mailhub=mail
# Example for SMTP port number 2525
# mailhub=mail.your.domain:2525
# Example for SMTP port number 25 (Standard/RFC)
# mailhub=mail.your.domain
# Example for SSL encrypted connection
# mailhub=mail.your.domain:465
mailhub=ha0s-laptop
# Where will the mail seem to come from?
rewriteDomain=
# The full hostname
hostname=_HOSTNAME_
# Set this to never rewrite the "From:" line (unless not given) and to
# use that address in the "from line" of the envelope.
#FromLineOverride=YES
# Use SSL/TLS to send secure messages to server.
#UseTLS=YES
# Use SSL/TLS certificate to authenticate against smtp host.
#UseTLSCert=YES
# Use this RSA certificate.
#TLSCert=/etc/ssl/certs/ssmtp.pem
Не хотелось бы ставить почтовых "монстров" вроде sendmail, postfix или exim.
Внешнюю почту отправляю через smtp-сервер провайдера, просто нужна возможность получать отчёты скриптов в /var/mail/lupo.