Setting the Postfix mail in Ubuntu

1. Install postfix

   apt install postfix

2. install mailx

   apt install mailutils

3. In the /etc/postfix/main.cf file, add -

    relayhost = [smtp.gmail.com]:587
   
    # Location of sasl_passwd we saved
    smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd
   
    # Enable SASL authentication for postfix
    smtp_sasl_auth_enable = yes
    smtp_tls_security_level = encrypt
   
    # Disallow methods that allow anonymous authentication
    smtp_sasl_security_options = noanonymous
   

   

   1. Create file under /etc/postfix/sasl/

      Filename: sasl_passwd

      Add the below line -

      [smtp.gmail.com]:587 <your email>:<your password>

      Ex- [smtp.gmail.com]:587 bhaskarmehta422@gmail.com:aasajrjiszawigyw

      Steps to set the Password -

      1. Go to this location in your browser and click on "Manage your Google Account"

         

         1. Click On Security -

            

And make sure that 2 Steps Verification is ON -

3. Search App passwords in the search bar and click on this -

4. Click on Select App and Click on (Other)Custom Name. Give a name example - smtp and click on Generate.

-> Once you click on Generate, it will generate a password for you and you can use this here.

1. Convert the sasl_passwd file into db file from /etc/postfix/sasl location

   postmap sasl_passwd

2. change the owenership of sasl_passwd

   chmod 600 *

3. Start the Postfix service

   systemctl start/enable postfix

   systemctl stop/disable postfix

   systemctl restart postfix

   systemctl status postfix

4. Send a test email

    echo "Test Mail" | mail -s "Postfix TEST" -A testfile.txt bhaskarmehta422@gmail.com
   

5. Output -