sasl_passwd

vim main.cf

{ADD THE FOLLOWING LINES}

relayhost = [smtp.gmail.com]:587

myhostname = <your hostname/SURAJ-LAPTOP>

587 is the port for secure TLS

To check your hostname use “hostname -f”

#Location of sasl_passwd we saved

smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd

#Enables 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

3.) now create a file at /etc/postfix/sasl/ named sasl_passwd

cd /etc/postfix/sasl/

vim sasl_passwd

Add the below line and change the “email.gmail” to your Gmail.

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

Go to mail which is used here and go to security and ENABLE 2-STEP VERIFICATION

Now go to app passwords in security => Click on select app => Choose other

Write “smtp” and click on generate

It will show a window in which a password is written. Copy the password and paste it in the above file “sasl_passwd” at <password>.

4.) Convert the sasl_passwd file into db file

postmap /etc/postfix/sasl/sasl_passwd

a new file sasl_passwd.db is created here

as it contain sensitive info so we only allow user to read and write permissions on this file

chmod 600 /etc/postfix/sasl/*

5.) start the postfix service

# To start the postfix service

systemctl start/enable postfix

# To stop the postfix service

systemctl stop/disable postfix

# To re-start the postfix service

systemctl restart postfix

6.) How to send an email

echo "Test Mail" | mail -s "Postfix TEST" email@gmail.com

7.) If you encounter any kind of error then go to main.cf file and comment on the line

# smtp_tls_security_level = may

After editing the file do

systemctl restart postfix.service

8.) to attach any file with the mail

Create a file testfile

vim testfile

#write something in the file to verify

"Suraj soni attach a file with the mail"

Save the file

echo "Test Mail" | mail -s "Postfix TEST" -a <filename/testfile> email@gmail.com