Faruque Ahmed : MCP, MCSA, MCSE, MCTS, MCIT, CCNA, OCA, OCP, GCP

Let’s Encrypt

Let’s Encrypt SSL on Ubuntu 24

apt install apache2 -y

Install Certbot and the Apache Plugin

apt install certbot python3-certbot-apache -y

Configure Apache

vim /etc/apache2/sites-available/worldcm.net.conf

---------<VirtualHost *:80> ServerAdmin webmaster@worldcm.net ServerName worldcm.netServerAlias www.worldcm.netDocumentRoot /var/www/html ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined </VirtualHost>---------

Enable the site and necessary modules with:
a2ensite worldcm.net.conf a2enmod rewrite a2enmod ssl

Verify the Apache configuration:
apache2ctl configtestsystemctl reload apache2

Obtain and Install an SSL Certificate

certbot --apache -d worldcm.net -d www.worldcm.netORcertbot --apache -d worldcm.net -d mail.worldcm.net

Set Up Auto-Renewal

# crontab -e
0 */12 * * * certbot renew --quiet

Postfix
vim /etc/postfix/main.cf
Configure Postfix to use TLS encryption:
smtpd_use_tls = yessmtpd_tls_security_level = maysmtpd_tls_protocols = !SSLv2, !SSLv3smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3smtpd_tls_CAfile = /etc/ssl/certs/ca-certificates.crt

Configure User Authentication (Optional): Install SASL Packages
sudo apt install libsasl2-modules sasl2-bin -y

Configure SASL: Open the SASL configuration file:
sudo vi /etc/postfix/sasl/smtpd.conf
Add:
pwcheck_method = saslauthdmech_list = plain login
Enable and start the SASL authentication daemon:
sudo systemctl enable saslauthdsudo systemctl start saslauthd

Configure Postfix to use SASLsudo vim /etc/postfix/main.cf
Add:
smtpd_sasl_type = dovecotsmtpd_sasl_auth_enable = yessmtpd_sasl_security_options = noanonymous

systemctl restart postfix

ll

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