A mail user agent (MUA) backend for PHP programs https://notabug.org/desktopd/desktopd

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Desktopd MUA (Currently in beta)

This is a new MUA backend for PHP programs. It is a part of Desktopd, a daemon framework in PHP for trivial desktop administration.

Note the only fully-supported character encoding is UTF-8. All internal data and intermediate results are in UTF-8 (or its strict subset US-ASCII).

All the source code files must be in UTF-8 (as always the case with any other Desktopd codes).

What is special

  • Developed with a clear design goal of providing an MUA backend in PHP.
  • Since it is a backend, no UI or I18N codes are included.
  • Supports basic features as an MUA implementation. (Can receive emails.)
  • Clean design with only client-side code included.
  • You will need an MSA to send emails, and a POP3 server to receive ones.
  • Acts like any other email clients, such as Mozilla Thunderbird or Evolution.


  • Cleaner than PHPMailer!
  • Namespaced, requires PHP 5.3.x+
  • Simple and small codebase (not too many options, no huge classes)
  • Receive messages with POP3
  • Send messages with SMTP submission (an external MSA required)
  • Full S/MIME encrypt/sign/decrypt/verify support
  • GnuPG support coming
  • UTF-8-centric design, no headaches
  • TLS with certificate pinning / forward security if possible
  • Send/receive complex nested multipart messages
  • Multiple TO/CC/BCCs


HTTPSEverywhere for Desktopd Copyright (C) 2015 Desktopd Developer(s)

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/.