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 en... 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
mailcow
mailcow is a user-friendly, open-source groupware and email suite built on Docker, leveraging established components for a seamless email server...
Why mailcow as an OpenSMTPD alternative?
- Provides a full email suite, unlike OpenSMTPD's SMTP implementation
- Bundles an open-source groupware system
- Installs as a Dockerized setup
- Supports external authentication sources where OpenSMTPD does not
iRedMail
Deploying a full-featured, open-source mail server takes mere minutes with this solution, which integrates essential components and best practices. Users...
Why iRedMail as an OpenSMTPD alternative?
- Includes Roundcube or SOGo webmail, rather than OpenSMTPD's SMTP server
- Runs on Debian and Ubuntu
- Offers professional technical support versus OpenSMTPD's community support
Mailu
Mailu offers a robust mail server solution through a collection of Docker images, emphasizing simplicity and user-centric features. It supports...
Why Mailu as an OpenSMTPD alternative?
- Adds IMAP and webmail; OpenSMTPD provides server-side SMTP
- Runs as a set of Docker images, unlike OpenSMTPD
- Provides a web administration interface
Poste.io
Poste.io allows users to set up a fully functional mail server within five minutes, simplifying the installation process through automation....
Why Poste.io as an OpenSMTPD alternative?
- Ships IMAP, POP3 and webmail, where OpenSMTPD implements SMTP
- Bundles web administration and webmail in one container
- Packages antispam and antivirus scanning in its image
- Restricts free edition to personal use, unlike OpenSMTPD, usable by everyone
Modoboa
Modoboa empowers users to establish their own secure email servers in under 10 minutes, eliminating reliance on conventional providers. It...
Why Modoboa as an OpenSMTPD alternative?
- Where OpenSMTPD stops at SMTP, Modoboa adds webmail and calendars
- Provides an online admin panel
- Offers paid support services, while OpenSMTPD is free under ISC
- Hosts user mailboxes
Zentyal
Zentyal serves as an effective alternative to Windows Server®, seamlessly integrating with Microsoft Active Directory® without disrupting users. It provides...
Cyrus IMAP
Cyrus IMAP serves as a robust email, contacts, and calendar server, renowned for its speed and security. It supports CardDAV...
Citadel
Citadel is an innovative platform that enables seamless email, collaboration, groupware, and content management tailored for both local hardware and...
GMS (Gordano Messaging Suite)
For growing businesses seeking reliable email solutions, GMS offers a straightforward approach without the confusion of jargon. With decades of...
KumoMTA
Architected for enterprise performance, KumoMTA efficiently handles millions of messages per hour on a single server, with seamless horizontal scaling...
Eudora Internet Mail Server
Eudora Internet Mail Server (EIMS) has received a rare update after 13 years, enabling support for newer hardware and Mac...
Haraka
Haraka is a high-performance, flexible SMTP server designed for modern email needs. Written in Node.js, it supports thousands of concurrent...
Dovecot Pro
Dovecot Pro stands out as a premier email backend, chosen by leading Telcos, ISPs, and Hosters. Its innovative Palomar architecture...
Kingmailer
KingSMTP.com offers a secure and efficient Transactional SMTP service tailored for businesses needing reliable email delivery. It enables seamless communication...
Courier
The Courier mail transfer agent (MTA) serves as an integrated mail and groupware server, supporting ESMTP, IMAP, POP3, and more...
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
