Best Mailman HQ Alternatives & Competitors in 2025

Simplehuman is a browser extension that brings advanced keyboard shortcuts and command bar to Gmail, and teaches how to use them as you use Gmail everyday ⚡️.

Key Simplehuman for Gmail features:

Advanced keyboard shortcuts Command bar Inbox Zero

paid Free Trial $4.0 / Monthly

Superhuman is an email management tool.

Key Superhuman features:

Speed User Interface Advanced Features Focus

Enterprise Email Warmup. Sender Domain Reputation Repair Tool to get out of spam and see open rates more than double in 4 to 14 days. We engage with your emails to teach mailbox providers not to send your email to the spam or the promotions folder.

Key InboxAlly features:

Increase deliverability on any platform Create multiple sender profiles to accomodate all of your domains/IPs Works with any email sending service Use your own content in emails you send

Try for free paid Free Trial $149.0 / Monthly (Send to 100 of our unique seed emails per day)

Email at its best, new from Basecamp.

Key HEY features:

Privacy-focused Clean Interface Innovative Features Unified Platform

paid Free Trial $99.0 / Annually

SaneBox is a cloud-based service that allows users to filter and manage their emails.

Key Sanebox features:

Email Organization Customization Compatibility Time-saving

Webmail service. Powered by RainLoop.

Key Teknik Mail features:

Privacy-Focused Ad-Free Experience Open Source No Tracking

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

Key Clean Email features:

User-friendly Interface Bulk Cleaning Smart Filtering Privacy-focused

paid Free Trial $9.99 / Monthly

Clean up your inbox, save the earth.

Key Cleanfox features:

Efficient Email Cleanup Environmental Impact User-Friendly Interface Free to Use

Cock.li is your go-to solution for professional E-mail addresses and XMPP addresses.

Key Cock.li features:

Anonymity Free Service Variety of Domains Minimal Data Retention

Secure email with absolutely no compromises. Get your free encrypted email account today.

Key ProtonMail features:

End-to-End Encryption Zero Access to User Data Swiss Privacy Laws Open Source

freemium €5.0 / Monthly (user - 5 GB)

The smarter, faster way to clean out your inbox. Power through thousands of messages in just a few clicks. Free Trial! Website. JOBS.

Key Mailstrom features:

Email Organization Bulk Actions Unsubscribe Feature Cross-Platform Compatibility

Mailo is an email client where you can send and receive emails to and from anyone with an email address.

Key Mailo features:

Privacy-focused Ad-free experience Custom domains Environmental commitment

Horde Groupware is a free, enterprise ready, browser based collaboration suite.

Key Horde features:

Open Source Wide Range of Features Web-Based Interface Active Community Support

One-click unsubscribe for mailing lists, straight from Gmail.

Key Trimbox features:

Efficient Email Management Privacy and Security User-friendly Interface