Sendmail Configuration postfix Install with Gmail SMTP

If You’r are running a Linux server and accept email, the only Sendmail Configuration is to use your mail service’s (SMTP) Simple Mail Transfer Protocol server.

Sendmail Configuration Google’s Gmail features a vigorous SMTP server that you simply can effectively arrange a Linux mail exchange specialist (MTA) like Sendmail or Postfix to utilize.

Prerequisites

Need root access
Gmail Account with “Less secure app access” enable.

Sendmail Configuration Action Plan:

Step 1:

Update the Package (optional)

sudo yum update

Step 2:

Install the mailx and postfix

sudo yum install postfix -y

yum install mailx -y

Step 3:

Check the install mailx and postfix with version

rpm -qa | grep postfix

rpm -qa | grep mailx

Step 4:

change the directory ‘/etc/postfix/’ in the directory we see main.cf and make a backup the file

cp main.cf main.cf_backup

Step 5:

After the backup now we configure the main.cf Add the two below two lines to the respective location. for the hostname use

relayhost = [smtp.gmail.com]:587

myhostname= <your_hostname>

And add these lines in the last of the file main.cf

####################################################

# 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

Step 6:

Create a directory ‘sals’ under ‘/etc/postfix/sasl/’

mkdir /etc/postfix/sasl/

Create a fie ‘sasl_passwd’under /etc/postfix/sasl/sasl_passwd

touch /etc/postfix/sasl/sasl_passwd

Step 7:

Generate an app password to use with Gmail’s SMTP server

https://myaccount.google.com/intro/security

Go to the Security and scroll down enabled two-factor authentication.

in the search 🔎 box Search for the ‘app passwords’ and select it

Enter the app name EX: SMTP click on Create button

Notice the 16 digits password and copy the password

Step 8:

Add the below line In the file /etc/postfix/sasl/sasl_passwd relace your mail and password.

[smtp.gmail.com]:587 your_mail@gmail.com:generated_password

Step 9:

Use postmap for database converting we notice below .db extension

postmap /etc/postfix/sasl/sasl_passwd

change the permissions.

chmod 600 *

Step 10:

Now we stop the sendmail if active

systemctl stop sendmail

Now we start the postfix

systemctl start postfix

systemctl enable postfix

systemctl status postfix

Step 11:

Now Testing the sendmail

The Output of the mail both Gmail and Outlook

The sendmail install successfully.

Thank you