How to Enable the SMTP Send Mail Authentication for Ubuntu 15.04 Vivid Postfix Mail Server

Ubuntu 15.04 Vivid Enabling SMTP Sendmail Authentication

Hi! The Tutorial shows you Step-by-Step How to Install Packages for Required SMTP Sendmail Authentication on a Ubuntu 15.04 Vivid Vervet Postfix Secure Mail Server.

With this SMTP Setup we are Stopping Unauthorized Mails Relaying and so the Users will Need to Authenticate for sending mails.

1. Open a Shell Session
   Ctrl+Alt+t on Desktop
   (Press “Enter” to Execute Commands)

   

   In case first see: Terminal QuickStart Guide.

2. Installing SMTP Cyrus SSL Auth Packages.

   sudo apt-get install libsasl2-2 libsasl2-modules libsasl2-modules-sql

   If Got “User is Not in Sudoers file” then see: How to Enable sudo

3. Configuring SMTP Authentication

   sudo nano /etc/postfix/main.cf

   Append:

   smtpd_recipient_restrictions = reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_recipient, reject_unknown_recipient_domain reject_unauth_destination, check_policy_service inet:127.0.0.1:10023, permit
   # modify the existing smtpd_sender_restrictions
   smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_unauth_pipelining, permit
   # then add these
   smtpd_sasl_auth_enable = yes
   broken_sasl_auth_clients = yes
   smtpd_sasl_security_options = noanonymous
   smtpd_sasl_local_domain =
   

   Ctrl+x to Save & Exit from nano :)
   Then Edit the Postfix SSL Config File:

   sudo nano /etc/postfix/sasl/smtpd.conf

   Add:

   pwcheck_method: auxprop/nauxprop_plugin: sql
   mech_list: plain login cram-md5 digest-md5
   sql_engine: mysql
   sql_hostnames: 127.0.0.1
   sql_user: postfixamdin
   sql_passwd: [postfixadminMySqlPass]
   sql_database: postfixadmin
   sql_select: select password from mailbox where username='%u@%r' and active = 1
   

   Change the ‘postfixadminMySqlPass’!
   Save & Exit
   Then Test Setup Restarting the Postfix MTA

   sudo service postfix restart

4. How to Setup a Multi Virtual Domain/Alias Ubuntu Mail Server.

   Get Multi Domains Posfix Mail Server Setup

   Ubuntu Multi-Domains Mail Server Setup