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MailChimp - MailChimp is the best way to design, send, and share email newsletters.
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Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Sidemail - The simplest way to send transactional emails. Sidemail makes sending transactional emails trivial, it's perfect for side projects, MVPs or the next big thing.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.