Best Free Email Marketing Platforms with Unlimited Contacts in 2026

The standout: Systeme.io offers true unlimited contacts on its free plan. More importantly, it pays 60% LIFETIME recurring commission on paid plans. For affiliate-savvy readers: 1 referral on Launch ($47/mo) = $28.20/mo recurring, forever. At 50 referrals: $1,410/mo = $16,920/year in recurring revenue. This is the highest commission in the email marketing category.

Looking for free email marketing with unlimited contacts? We compare Systeme.io, Brevo, MailerLite & more. For deeper dives into specific platforms, see our Omnisend Review, Klaviyo vs Omnisend comparison, and our Klaviyo Alternatives guide.