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What is OpenSMTPD?

OpenSMTPD is a free implementation of the SMTP protocol designed for email communication on the server side, adhering to the specifications outlined in RFC 5321 while also including various standard extensions. This software allows standard machines to engage in email exchanges with other systems that operate under the SMTP protocol. Created out of a need for a more effective alternative to existing email solutions, OpenSMTPD provides a thorough SMTP implementation. The project is primarily led by developers Gilles Chehade and Eric Faurot, with significant contributions from many OpenBSD developers and collaborators from diverse communities. The ongoing development of OpenSMTPD demonstrates a strong dedication to enhancing the functionality and reliability of email servers across multiple platforms. As a result, it has gained popularity among users seeking a robust and flexible email server solution.

What is Citadel?

Citadel provides a suite of solutions for email, collaboration, groupware, and content management that can be easily installed on local servers or utilized through the cloud. Its distinctive room-based framework not only enhances user experience but also offers remarkable flexibility and durability. Unlike other platforms, it seamlessly combines an extensive array of functionalities while upholding a consistent and user-friendly interface. Being entirely open source and released under the GNU General Public License, Citadel allows users to access the complete version without any constraints or fees. You can obtain the latest and most sophisticated version from their website, and the most appealing aspect is that it is completely free of charge. This positions Citadel as an outstanding option for anyone in search of robust and inclusive software solutions without the hefty costs typically linked to enterprise software. Furthermore, its commitment to open-source principles fosters a sense of community and collaboration among users and developers alike.

Media

Media

Integrations Supported

Docker
Muraena
Ubuntu

Integrations Supported

Docker
Muraena
Ubuntu

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Trial Offered?
Free Version

Pricing Information

Free
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

OpenSMTPD

Company Website

www.opensmtpd.org

Company Facts

Organization Name

Citadel

Company Website

www.citadel.org

Categories and Features

Categories and Features

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