Mailster Alternatives

MessageOne offers email management solutions such as EMS and AlertFind for archiving, e-discovery, security and notification services.

Email security to protect against email-borne phishing, spear phishing, malware, and ransomware. Email security and management based on artificial intelligence.

Warmup Inbox is a tool that automates the process of warming up your email inboxes, raising your sender reputation and inbox health automatically.

Try for free paid Free Trial $12.0 / Monthly (Per inbox, per month.)

Clean Email is an online service that empowers you to take control of your mailbox.

paid Free Trial $9.99 / Monthly

Allows you to run a free Listserv or email group right from your WordPress dashboard.

Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.

freemium

Mailman is free software for managing electronic mail discussion and e-newsletter lists.

Web-based IMAP email client

Open Source

Email Marketing List Manager

Open Source

Email marketing from GetResponse. Send email newsletters, campaigns, online surveys and follow-up autoresponders. Simple, easy interface. FREE sign up.

Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates

The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.

The Slack bot for external communications

Simple, beautiful & blazing fast email app now on Mac.