The best email marketing tools to try in 2026

Across the most-reviewed tools, the market splits between developer-first delivery, SMB-friendly campaign builders, and outbound-heavy sales platforms. Resend and similar API-led options suit transactional flows, event triggers, and deliverability control, while MailerLite emphasizes newsletters, automations, landing pages, and commerce. lemlist stands out for cold outreach with lead sourcing, multichannel sequencing, and personalization."