
Exim
Sendmail
Mail-in-a-box
Zimbra
qmail
KumoMTA
iRedMail
Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

Exim
Sendmail
Mail-in-a-box
Courier-MTA
sSMTP
Haraka
Dragonfly Mail Agent
OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...

Which is more popular?
Based on our record, OpenSMTPD should be more popular than Postfix. It has been mentioned 2 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | postfix.org | opensmtpd.org |
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What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Postfix is ideal for businesses, educational institutions, or individual users who need a robust and secure email server. It is especially recommended for environments requiring high-performance and stable email systems, as well as those looking for a solution that can handle large-scale email distribution efficiently.
No analysis of OpenSMTPD yet.
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DAY[0] Episode #31 - kr00k, GhostCat, and more issues from NordVPN, Samsung, OpenSMTPd
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Postfix and OpenSMTPD. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Postfix is an MTA that allows the user to receive and deliver electronic mail. The platform is open-sourced that is easy to administer, attempts to be fast, and a secure way for the usage of EM. It is also known by...
Postfix is very emphatic when it comes to security. Like iRedMail, it is able to encrypt your sessions and perform certificate-based authentication to keep your mail services secure, private, and protected. Postfix...
OpenSMTPD is an implementation of the server-side SMTP protocol, with some additional standard extensions. Its design goals include security, reliability, ease of configuration, and support for common use cases.
Recommendations tracked on public social media and blogs since March 2021.


Read the documentation on postfix.org and/or buy one of the many available Postfix books (it really helps to understand the Postfix philosophy). Source: over 5 years ago
I've had something of the same experience with Postfix, u/0x29aNull. Check out OpenSMTPD. It is lightweight and standards compliant. I know that there are packages for Debian and Alpine Linux. There may also be ones for Fedora/RHEL... Source: over 3 years ago
When I installed Rspamd with on OpenBSD / OpenSMTPD the other day, DKIMProxy out (dkimproxy_out daemon), which had been got via OpenBSD Ports package system, was used to add DKIM signatures to mails in order to improve security on emails. - Source: dev.to / over 5 years ago
When comparing Postfix and OpenSMTPD, you can also consider the following products.

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
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Sendmail is a general purpose internetwork email routing facility that supports many kinds of...
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Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.
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Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
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The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open...
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Qmail is an advanced-level mail transfer agent for the UNIX-based operating systems.
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