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'''Sendmail Null Client (Debian)'''
== Installation ==
{{Command|<nowiki>aptitude install sendmail</nowiki>}}
== Setting-up ==
Replace ${ADMIN_EMAIL}, ${HOSTNAME}, ${DNS_DOMAIN}, ${IP_ADDR} for the adequate values.

Redirect messages from root, postmaster, admin, etc, to the administrator.

Edit /etc/mail/aliases
{{File|/etc/mail/aliases|<pre><nowiki>
...
operator: root
admin: root
root: ${ADMIN_EMAIL}
...
</pre></nowiki>}}
Update the aliases database:
{{Command|<nowiki>/usr/sbin/newaliases</nowiki>}}
Verify that sendmail knows about the different names that the client can have.

Editar /etc/mail/local-host-names
{{File|/etc/mail/local-host-names|<pre><nowiki>
...
 localhost
 localhost.localdomain
 ${HOSTNAME}
 ${HOSTNAME}.${DNS_DOMAIN}
...
</pre></nowiki>}}
Verificar que el host aparece en /etc/hosts

 ${IP_ADDR}  ${HOSTNAME}.${DNS_DOMAIN}  ${HOSTNAME}

Editar /etc/mail/sendmail.mc

 (...)
 dnl #
 dnl # Masquerading options
 FEATURE(`always_add_domain')dnl
 MASQUERADE_AS(`${HOSTNAME}.${DNS_DOMAIN}')dnl
 FEATURE(`allmasquerade')dnl
 FEATURE(`masquerade_envelope')dnl
 dnl #
 dnl # Default Mailer setup
 MAILER_DEFINITIONS
 MAILER(`local')dnl
 MAILER(`smtp')dnl

Activar la nueva configuración

 yes | sendmailconfig

== Seguridad ==
Por omisi&oacute;n Debian instala sendmail habilitado solo para localhost<br>
Si se usan tcp-wrappers, se debe agregar una l&iacute;nea similar a la siguiente en 
/etc/hosts.allow

 sendmail: 127.0.0.1

Si se usan otros filtros se debe permitir el acceso al puerto localhost:25/tcp desde localhost:>1025/tcp

== Limpieza (opcional)==
Eliminar el ssmtp

 aptitude remove ssmtp

Si la configuración DNS no está definida en /etc/network/interfaces, eliminar el resolvconf
 aptitude remove resolvconf