What is a sending domain?

A sending domain is the web address (e.g., yourcompany.com) that appears in the "From" field of your emails. It's crucial for deliverability because it allows email servers to authenticate your messages using protocols like SPF, DKIM, and DMARC. This authentication verifies that you are authorized to send emails from that domain, helping to prevent spoofing and phishing, and ultimately improving your sender reputation. Without a properly configured sending domain, your emails are more likely to be flagged as spam or rejected. Your sender email address is the specific email address (e.g., info@yourcompany.com) but not the underlying domain itself. The platform through which you send emails is your ESP, like Klaviyo, which hosts your sending infrastructure but isn't the domain.