Domains & DNS
SSL Certificates & Email Routing
Make your site trustworthy with HTTPS and keep mail flowing to the right place.
Learning objectives
- Understand SSL/TLS certificates
- Enable automatic renewal
- Configure MX and SPF/DKIM records
SSL/TLS certificates
An SSL/TLS certificate enables HTTPS, encrypting data in transit and confirming the site belongs to the expected owner. Free certificates such as Let's Encrypt can be installed and auto-renewed without cost.
Never let a certificate lapse
An expired certificate makes the browser show a security warning, which users interpret as a compromised site. Automate renewal so this cannot be forgotten.
Email routing
Email is directed by MX records. Spam filters verify senders with SPF and DKIM records; without them, legitimate mail from your domain is often rejected.
Key takeaways
- HTTPS is free and non-negotiable today.
- Automate certificate renewal.
- Configure email authentication records to protect deliverability.