
Postfix
Exim
Sendmail
Mail-in-a-box
Courier-MTA
sSMTP
Haraka
OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...
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Which is more popular?
Based on our record, OpenSMTPD seems to be more popular. It has been mentioned 2 times since March 2021.
Website, pricing, platforms and company facts side by side.
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TDP
TaskDocPro
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| Website | opensmtpd.org | digitaldocs.calliarc.com |
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What each product offers, as listed by its team.

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Possible disadvantages
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No analysis of OpenSMTPD yet.
Overall verdict
Why this product is good
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DAY[0] Episode #31 - kr00k, GhostCat, and more issues from NordVPN, Samsung, OpenSMTPd
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External articles and on-site reviews we used to compare the two products.

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.
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Recommendations tracked on public social media and blogs since March 2021.

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
Tracking TaskDocPro since Jun 2023.
When comparing OpenSMTPD and TaskDocPro, you can also consider the following products.

Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
Compare Postfix to OpenSMTPD or TaskDocPro:

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
Compare Exim to OpenSMTPD or TaskDocPro:

Sendmail is a general purpose internetwork email routing facility that supports many kinds of...
Compare Sendmail to OpenSMTPD or TaskDocPro:

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.
Compare Mail-in-a-box to OpenSMTPD or TaskDocPro:

The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open...
Compare Courier-MTA to OpenSMTPD or TaskDocPro:

sSMTP is a simple MTA to deliver mail from a computer to a mail server.
Compare sSMTP to OpenSMTPD or TaskDocPro: