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Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Akismet - Akismet is a spam fighting service that protects millions of WordPress sites from comment and contact form spam.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
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Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates