Mailspring is built on the modern web with Electron, React, and Flux. It is designed to be extensible, so it's easy to create new experiences and workflows around email. 
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Mailspring comes packed with powerful features like Unified Inbox, Snooze, Send Later, Mail Rules, Templates and more. Mailspring Pro, which you can unlock with a monthly subscription, adds even more features for people who send a ton of email: link tracking, read receipts, mailbox analytics, contact and company profiles. All of these features run in the client - Mailspring does not send your email credentials to the cloud. 
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You can have unified inbox as it supports every major mail provider—Gmail, iCloud, Office 365, Outlook.com, Yahoo!, and IMAP/SMTP—so you have a single, streamlined command center for all your messages. 

Mailspring is built on the modern web with Electron, React, and Flux. It is designed to be extensible, so it's easy to create new experiences and workflows around email. 

Mailspring - A beautiful, fast Webmail

FairEmail is easy to setup and works with virtually all email providers, including Gmail, Outlook and Yahoo. It supports Unlimited accounts, Unlimited email addresses,Unified inbox, Offline storage and operations, Conversation threading, Encryption, Anti Phishing, Automatically recognize and disable tracking images and lot more.

FairEmail - Privacy friendly email app for Android

K-9 Mail is an open-source email client for Android.
<ul>
  <li>Push IMAP support</li>
  <li>WebDAV support</li>
  <li>Attachment saving</li>
  <li>Attach any file on the SD card type when <a href="http://www.openintents.org/filemanager/">OI File Manager</a> is installed</li>
  <li>BCC to self</li>
  <li>Signatures</li>
  <li>Message flagging</li>
  <li>Per account notification</li>
  <li>Choice of black or white theme</li>
  <li>Multiple identities</li>
  <li>Message list sorting</li>
  <li>Keyboard shortcuts</li>
  <li>Many performance enhancements</li>
  <li><a href="https://k9mail.github.io/documentation/security/pgpmime.html">GPG &amp; PGP/MIME support</a> using OpenKeychain (formerly APG)</li>
  <li>Emoji support</li>
  <li>Pinch-to-zoom</li>
  <li>Mail on SD</li>
</ul>

K-9 Mail is an open-source email client for Android.

K-9 Mail – Advanced Email for Android

Tutanota automatically encrypts all your data on your device. Your emails as well as your contacts stay private. You can easily communicate with any of your friends end-to-end encrypted. Even subject and attachments as well as all your contacts are encrypted. It provides an open webmail service that is very easy to use.

Tutanota - Encrypted MailBox

Mutt is a small but very powerful text-based mail client for Unix operating systems. Its features include message threading, POP3, IMAP support, support for multiple mailbox formats (mbox, MMDF, MH, maildir), Delivery Status Notification (DSN) support, multiple message tagging, translation into at least 20 languages and lot more.

Mutt - Text based E-Mail Client

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Mailspring - A beautiful, fast Webmail

FairEmail - Privacy friendly email app for Android

K-9 Mail – Advanced Email for Android

Tutanota - Encrypted MailBox

Mutt - Text based E-Mail Client

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Mailspring - A beautiful, fast Webmail

FairEmail - Privacy friendly email app for Android

K-9 Mail – Advanced Email for Android

Tutanota - Encrypted MailBox

Mutt - Text based E-Mail Client

TechStack

Tagcloud

License