# Sending Subdomain Architecture ## Differentiating Domains & Subdomains An email subdomain is **a prefix** added to your **main domain name** that creates a distinct sending identity.
Email address anatomy
If your company domain is **`company.com`**, you might use subdomains like: * **news****.company.com**, for your newsletters and marketing communications. * **account****.company.com**, for your service related communications. * Etc ## Why Use Separate Subdomains Instead of a Root Domain? Most mailbox providers track the reputation of **each subdomain separately**. Think of it like having different phone numbers for different departments in your company—each builds its own reputation based on how it's used. We strongly recommend using **dedicated subdomains for different email types**—particularly separating transactional emails (e.g. password resets, receipts, account notifications) from marketing emails (e.g. newsletters, promotional campaigns). Here is how a typical email setup looks like:
{% hint style="info" %} Know more on the ideal sending structure and subdomains in our dedicated article: [sending-infrastructure-best-practices](https://doc.batch.com/guides-and-best-practices/email-deliverability/email-authentication-and-sending-structure/sending-infrastructure-best-practices "mention") {% endhint %}