The Behind-the-Scenes Magic: How Email Marketing Platforms Connect to Your Domain to Send Emails on Your Behalf | HackerNoon
Briefly

To begin sending emails on your behalf, the email marketing platform needs to verify that you own the domain you're using. This verification process involves adding a specific DNS (Domain Name System) record to your domain provider's settings, confirming to the email marketing platform that you have control over your domain.
DNS records serve as the blueprint for how your domain interacts with other internet services; they confirm that you have control over your domain. This process is crucial for ensuring your emails get delivered and pass spam filters, thereby maintaining your brand's credibility.
A TXT record, which is added to your domain's DNS settings, serves as a proof of domain ownership for email marketing platforms. Only the domain owner can edit these records, which are fundamental for setting up email communication effectively.
There are several steps involved in setting up your email domain with a marketing platform, including verifying your domain, setting up email verification, adding DNS records, and monitoring email deliverability and reputation, which all ensure your emails reach their intended recipients.
Read at Hackernoon
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