Brevo

Brevo (formerly Sendinblue) handles email, SMS, and CRM in one system. Its official WordPress plugin connects directly to your site, letting you build forms and sync WooCommerce orders automatically. You get transactional email built in, so order confirmations and shipping notices go out reliably.

Best for WordPress stores that want email and SMS together without jumping between tools. Setup is straightforward if you're comfortable with plugin installs, and the CRM features let you segment contacts by behavior or purchase history.