OpenSMTPD Description
OpenSMTPD implements the server-side SMTP standard as defined in RFC 5321 with some additional extensions. It allows machines to send and receive emails from other systems that use the SMTP protocol. OpenSMTPD was born out of dissatisfaction over other SMTP implementations. It is a complete SMTP implementation. OpenSMTPD was developed primarily by Gilles Chehade, Eric Faurot and other OpenBSD hackers.
OpenSMTPD Alternatives
Mailu
Mailu is an easy-to-use, yet powerful mail server that comes as a Docker image. It is open source software, which means it's free (as in free beer and free speech), and is open to external contributions. The project aims to provide people with an easily configured, easily maintained, and full-featured email server without shipping proprietary software or unrelated features that are often found in popular groupware.
The main features include:
Standard email server with IMAP, IMAP+, SMTP, and Submission profiles for clients
Advanced email features: aliases and domain aliases. Custom routing
Webmails, multiple access to webmails, and administration interface
User features, aliases auto-reply and auto-forward. Fetched accounts
Admin features, global admins, announcements, per-domain delegation, quotas
Security, enforced, TLS, DANE MTA-STS Letsencrypt, outgoing DKIM Anti-virus scanner Snuffleupagus Block malicious attachments
Antispam, auto-learn, greylisting, DMARC& SPF, anti-spoofing
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iRedMail
Open source softwares are the best way to build a mail server. Works on CentOS Stream (Rocket, Alma), Debian, Ubuntu and FreeBSD.
You can deploy a FREE, OPEN SOURCE, FULLY FURNISHED, FULL-FEATURED email server in a few minutes.
We did all the heavy lifting by combining open source components and applying best practices. Our product takes care of all the major tasks. We also offer professional support in case of any problems.
You can control email security and view the transaction log. No one else can read the content of your messages. All components in iRedMail come from open source softwares. You get bug fixes and updates directly from the Linux/BSD vendors you trust. iRedMail allows you to build a mail server using open source softwares.
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Horde
Horde is the world's most flexible groupware, making it the ideal platform for building your business productivity software. Horde is the only open source groupware that connects to and supports more backends than any other system. This allows you to continue using your existing userbase, and your users will not need to remember any new passwords. Horde's feature-set rivals that of the largest enterprise email system. We have a feature set that is superior to any other competitor in our primary apps, such as mail, calendar, and address book, and even more in secondary apps, such as time tracking, wiki and ticketing.
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MDaemon Email Server
MDaemon Email Server supports IMAP and SMTP protocols. It delivers solid performance thanks to its feature-rich, user-friendly design. The email server software is low in total cost of ownership (TCO), and is specifically designed to meet the needs small- to medium-sized businesses. MDaemon supports multiple languages, content filtering, and multiple domains. It also offers flexible administration and an open standard design.
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Pricing
Pricing Starts At:
Free
Free Version:
Yes
Integrations
No Integrations at this time
Company Details
Company:
OpenSMTPD
Website:
www.opensmtpd.org
Media
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Product Details
Platforms
Mac
Linux
Type of Training
Documentation
Customer Support
Online
OpenSMTPD Features and Options
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