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Browse free open source Email Clients and projects below. Use the toggles on the left to filter open source Email Clients by OS, license, language, programming language, and project status.

  • One Platform. Total IT Insight. Start with PRTG Now Icon
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  • Dominate AI Search Results Icon
    Dominate AI Search Results

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  • 1
    GoldBug - Encrypted Communications

    GoldBug - Encrypted Communications

    Chat Messenger. E-Mail-Client. Websearch. Filetransfer.

    GoldBug is a decentralized & secure communication suite that offers an integrated e-mail client, an instant messenger & a file transfer. Also included is an URL-RSS-DB & a p2p web search. Current vers. w/ McEliece Algorithm. GoldBug has been 2013 - 2023 ten years just another Graphical User Interface of the Spot-On Encryption Suite. Main GUI features: Minimal & colorful Interface with Tabs in the East. Microsoft & Qt MinGW deprecated Win32 & for Compiling: ● https://sourceforge.net/p/goldbug/wiki/compiling As Spot-On implemented the minimal GB-concept & Nuvola Icons, GoldBug has now been fully integrated into Spot-On Win64: Just choose Tabs at East & Mini-View in Options - w/ Nuvola Icons of course! Voilá! & Many Thanks, Pro-Files can be found archived at ● current source: https://github.com/textbrowser/spot-on ● EN Manual: https://www.amazon.com/dp/3749435065 ● DE: https://compendio.github.io/goldbug-manual-de/ ● Study: https://www.amazon.com/asin/dp/3750408971
    Downloads: 10 This Week
    Last Update:
    See Project
  • 2
    E-mail Spoofer is a tool designed for penetration testers who need to send phishing e-mails. It allows to send mails to a single recipient or a list, it supports plain text/html email formats, attachments, templates and more... Update Version 1.1: =============== * Added text conversion to Homographs for bypassing spam filters. (based on http://www.exploit-db.com/wp-content/themes/exploit/docs/20114.pdf) * Added Reply-To header * Added Sender Name Field * Added Built in User Agent * Detailed error log If you find this tool useful crypto currency donations are welcome: Bitcoin: 1Kksc9b4WZ5X36xGDgpodPVpBSozMje6ui Litecoin: LQ1JCMxo122FpJ8iKX7HsrNtjCacpTkkFW
    Downloads: 5 This Week
    Last Update:
    See Project
  • 3
    With Tiger Envelopes you can stop snoops from reading your email. Same email client. No extra steps. One click to install on Windows and Linux. Configures Outlook, Thunderbird, and KMail. Supports GPG, PGP, Bouncy Castle encryption.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 4
    Aegis Implicit Mail (AIM)

    Aegis Implicit Mail (AIM)

    Send Mime and Smime Emails to Any Type of Mail Server

    Aegis Implicit Mail is a free and open source library which is designed to provide fast and developer friendly API to send emails using SMTP ports. Binaries are available in the form of NuGet package: https://www.nuget.org/packages/AIM Please check http://pki.tools/aim.html as well AIM Supports : * None Ssl Mails * Implicit Ssl Mails * Explicit Ssl Mails * Smtp Connection test * Detect Ssl type of mail server * Attachments for MIME and S/MIME message. * In-line attachment and separate file attachment * All content types and mimes * SMIME , Signed and Encrypted mails In an integrated way Sadly, Microsoft.Net.Mail Ssl Mails does not support Implicit Ssl Mail and it is still used by many servers, including port 465 of Gmail here AIM comes to make a readable and fast alternative to send your smtp mails. For unicode issues please refer to https://sourceforge.net/p/netimplicitssl/tickets/4/ . We really appriciate any help in testing of different encodings
    Downloads: 1 This Week
    Last Update:
    See Project
  • Powerful Website Security | Continuous Web Threat Platform Icon
    Powerful Website Security | Continuous Web Threat Platform

    Continuously detect, prioritize, and validate web threats to quickly mitigate security, privacy, and compliance risks.

    Reflectiz is a comprehensive web exposure management platform that helps organizations proactively identify, monitor, and mitigate security, privacy, and compliance risks across their online environments. Designed to address the growing complexity of modern websites, Reflectiz provides full visibility and control over first, third, and even fourth-party components, such as scripts, trackers, and open-source libraries that often evade traditional security tools.
    Learn More
  • 5
    DKIM for JavaMail is a small JAR that can be easily implemented in existing Java projects using JavaMail for sending DKIM signed emails.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 6
    Cassiopeia's BitMail

    Cassiopeia's BitMail

    Encrypting E-Mail Client

    BitMail is a Proof-of-Concept- / Design-Study for an Qt E-Mail Client. POP3 / IMAP / SMTP / P2P E-Mail-Client. ● Qt E-Mail Client. ● Build-in Encryption to secure E-Mails ● IMAP & POP3 ● Additionally a full decentral P2P Email-Option via the Echo Protocol ● Store Email for Offline-Friends in the P2P Network. ● Chat and Instant Messaging is build in. ● POPTASTIC function (Chat over Email) ● Calendar widget functionality. ● Open Source. BSD License. "Cassiopeia is the tortoise of Momo, which can communicate through writing on her shell and guides into the future." - Wikipedia. Source from: https://sf.net/projects/spot-on/files/ & https://github.com/textbrowser/spot-on
    Downloads: 2 This Week
    Last Update:
    See Project
  • 7
    GnuPG Components for Delphi and freepascal
    Downloads: 2 This Week
    Last Update:
    See Project
  • 8
    IDTrans is developing b2b technologies. The primary aspects of the project are secure transmission libraries, a key server, and a application to demonstrate the use of the libraries.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 9
    Mailcrypt is an Emacs Lisp package which provides a simple interface to public key cryptography with PGP [and now GnuPG!]. Mailcrypt makes strong cryptography a fully integrated part of your normal mail and news handling environment
    Downloads: 0 This Week
    Last Update:
    See Project
  • Run applications fast and securely in a fully managed environment Icon
    Run applications fast and securely in a fully managed environment

    Cloud Run is a fully-managed compute platform that lets you run your code in a container directly on top of scalable infrastructure.

    Run frontend and backend services, batch jobs, deploy websites and applications, and queue processing workloads without the need to manage infrastructure.
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  • 10
    MozPETs is an effort to build a web browser and mail client with strong privacy and security features. It is based on Mozilla.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 11
    PHP functions and classes to add a Domain Key Identified Mail (DKIM RFC 4871) signatures to emails sent by PHP. It is based on the openssl extensions of PHP. It can generate DKIM signature but cannot verify them. Developped and tested on PHP 4.0.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12
    PeMaR is a gateway, that relays outgoing email to anonymous remailer networks and receives and decodes anonymous mixminion messages. It allows the use of any email client to send and receive anonymous email. An extension is available for Thunderbird.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13
    An Experimental Platform for Secure Peer Services, QARE uses a decentralized trust model, a Public Key Infrastructure and provides single logon for multiple applications running across multiple systems. WAR files are used to add applications.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14
    A C library with support for logging, configuration, networking, message specification, semaphores, message queues, SSL, timing, epoll and email functionality.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    A Visual Basic Script (VBS) using CDO and XHTML objects to automatically report Microsoft Outlook 98,2k,2k3 (and ?) mailItems placed by the user in a folder named spam (directly under Inbox) to spamcop.net, and log the result in HTML format and move
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    jmom is a cross platform email client, written in java and taking advantage of SWT for a faster, native look and feel. Supports imap, pgp, ssl, and filters. Also an IM Client supporting AOL Instant Messenger and MSN Messenger, and CVS Client are in the
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    An attempt to send a full flagged MIME based email using open relay mail servers (authentication not required). Written in Python3. Using smtplib and email liabraries TODO: Bruteforce the SMTP authentication. Support TLS.
    Downloads: 0 This Week
    Last Update:
    See Project
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