Brevo (formerly Sendinblue) has the most generous free tier in email marketing: 100,000 contacts stored and 300 emails per day, with automation and segmentation included. That's unusual enough to be genuinely notable. For businesses with large but infrequently-mailed lists: say a 20,000-contact list you mail once a month: Brevo's email-volume-based pricing is often cheaper than contact-count-based alternatives.
The paid plans start at $9/month for 5,000 emails, scaling to $25/month for 20,000. The Starter plan does include Brevo branding on emails by default; removing it costs $9/month extra, which is an annoying add-on at that price point. AI features are present but not the focus: Brevo's strength is deliverability, transactional email, and the free-tier accessibility for businesses just getting started with email marketing.