OpenSMTPD
OpenSMTPD 7.6, released on October 13, 2024, is a robust, free implementation of the server-side SMTP protocol, adhering to RFC 5321 with added standard extensions. It enables seamless email exchange between systems, developed by Gilles Chehade, Eric Faurot, and contributors from the OpenBSD community, ensuring efficiency and reliability.
Top OpenSMTPD Alternatives
Cyrus IMAP
Cyrus IMAP serves as a robust email, contacts, and calendar server, renowned for its speed and security.
Modoboa
Modoboa empowers users to establish their own secure email servers in under 10 minutes, eliminating reliance on conventional providers.
Citadel
Citadel is an innovative platform that enables seamless email, collaboration, groupware, and content management tailored for both local hardware and cloud environments.
Eudora Internet Mail Server
Eudora Internet Mail Server (EIMS) has received a rare update after 13 years, enabling support for newer hardware and Mac OS X versions up to 10.14.
Mailu
Mailu offers a robust mail server solution through a collection of Docker images, emphasizing simplicity and user-centric features.
iRedMail
Users retain control over their personal data and email security, with robust encryption measures in...
Mailtraq
Unlike other options, it provides full control over email storage and access, ensuring privacy and...
mailcow
Recent updates enhance security and functionality, including support for external authentication sources, improved database configurations...
hMailServer
It efficiently supports essential email protocols such as IMAP, SMTP, and POP3, ensuring seamless integration...
Mercury Mail Transport System
It streamlines the delivery process, allowing users to access messages from their mailboxes at their...
Dovecot
It optimizes hardware utilization and offers robust support, making it ideal for leading Telcos, ISPs...
Zentyal
It provides essential services like SMTP and POP3/IMAP mail servers, ensuring reliable Internet access...
Poste.io
With SMTP, IMAP, and POP3 support, complemented by robust antispam and antivirus features, it prioritizes...
Top OpenSMTPD Features
- Free and open-source
- Supports standard SMTP protocol
- Additional standard extensions
- Developed by experienced contributors
- Part of OpenBSD Project
- ISC license for reusability
- Comprehensive SMTP implementation
- User-friendly configuration
- Active community support
- Regular updates and releases
- Robust security features
- Lightweight and efficient
- Flexible routing options
- Built-in logging capabilities
- Customizable mail handling
- Compatible with diverse systems
- Easy integration with other tools
- Detailed documentation available
- Performance optimizations for scalability
- Strong focus on simplicity and reliability
