Hosting and domains: how to properly configure DNS for a website and mail?
Proper configuration of the Domain Name System (DNS) for your website and mail server is a fundamental task upon which the stability of all web services and message deliverability depends. In the process of administering hosting and domain infrastructure, experience shows that regular software updates and reliable backups have a much higher priority than fine-tuning and exotic parameter configurations. Automating the backup creation process and mandatorily implementing two-factor authentication at all levels of domain name management will protect you from catastrophic consequences in the event of human error or cyberattacks.
The first thing to do when setting up DNS is to correctly specify the base records for your website to work. The main record is the A record, which links the domain name to the IP address of your web server, as well as its counterpart, the AAAA record, for IPv6 protocol support. To ensure the site opens both with and without the www prefix, a corresponding CNAME record or a duplicate A record is created. The presence of these elements in the domain registrar's control panel provides users with instant access to your resource from anywhere in the world.
The second critically important direction is configuring records for the full functioning of email. The basis here is the MX record, which tells senders' mail servers exactly where to deliver emails for your domain. Without properly configured MX records, sending and receiving corporate mail on your domain will become technically impossible, so this stage should be approached with maximum attention.
The third step to protect mail and prevent your emails from ending up in spam is implementing special TXT records, such as SPF, DKIM, and DMARC. The SPF record defines the list of servers allowed to send emails on behalf of your domain, DKIM adds a digital signature to each sent message, and DMARC sets the policy for handling emails that fail verification. Competently filling out these records protects the domain from attackers and guarantees high deliverability of legitimate emails to your clients and partners.
The fourth step as part of ensuring the security of your infrastructure is automating processes and protecting accounts. Since access to DNS zone management grants full control over the site and mail, it is extremely important to set up two-factor authentication in the domain registrar's panel. Additionally, it is recommended to set up automatic backup of zone configuration files and periodically check the relevance of these backups, which will allow you to restore the operation of services in a matter of minutes in case of unforeseen failures.