Configure Postfix (Relay Host - Smarthost - Mailer) With Authentication

 

Fisrt install server SMTP, run command.

 apt-get install postfix

 In the wizard, Choose “Internet Site”

 

Second install libsasl2-2, sasl2-bin and libsasl2-modules

apt-get install libsasl2-2 sasl2-bin libsasl2-modules

Edit file config postfix.

nano /etc/postfix/main.cf

""""

smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_authenticated_header = yes 

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = relay.midomain.com #optional

""""

 

Create or edit this file:

nano /etc/postfix/sasl/smtpd.conf

Add the following lines:
""""
 pwcheck_method: saslauthd
 mech_list: plain login

""""""

Edit file the config saslauthd, change next options:

nano /etc/default/saslauthd

 

""""

START=yes

OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd" 

"""" 

Restart deamon the saslauthd.

/etc/init.d/saslauthd restart

 Restart Postfix.

/etc/init.d/postfix restart

Add user linux for send mail.

adduser myuserrlay --shell=/bin/false --no-create-home

Complete wizard. 

Test your relay.