Simple utility to check if an email address uses a free email provider.

This is useful if you want to rule out generic personal emails, like gmail, outlook, etc.

import { isFreeEmail } from "https://esm.town/v/stevekrouse/free-mail/main.ts";

await isFreeEmail("user@gmail.com");     // false (is free email)
await isFreeEmail("user@company.com");   // true (not free email)

• Loads a list of free email domains from domains.txt
• Returns false if the email domain is in the free domains list
• Returns true if the email domain is NOT in the free domains list

Domain list sourced from HubSpot's blocked domains feature.