Does the job!
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Email Verifier - Email verifier app lets you verify email.
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
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI