
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...

Decode and verify SSL/TLS certificates online. Extract X.509 details including issuer, validity, SAN, and fingerprint. Fast, secure, and browser-based.

Which is more popular?
Based on our record, OpenSMTPD should be more popular than Cert Decoder. It has been mentioned 2 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | opensmtpd.org | certdecoder.com |
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In their own words, as submitted to SaaSHub.


No description of OpenSMTPD yet.
Cert Decoder is a free online tool that helps you decode X.509 SSL/TLS certificates in PEM format. It instantly shows important information like the issuer, expiry date, SAN entries, and fingerprint. All data is processed locally in your browser, so nothing is ever sent or stored elsewhere.
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.


No analysis of OpenSMTPD yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
DAY[0] Episode #31 - kr00k, GhostCat, and more issues from NordVPN, Samsung, OpenSMTPd
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing OpenSMTPD and Cert Decoder.
Cert Decoder's answer:
I built certdecoder.com over the weekend for my own needs. Sometimes in my work, I need to verify and check certificate details.
Cert Decoder's answer:
certdecoder.com was built using just JavaScript and HTML—simple, fast, and with all processing happening locally in your browser, so no certificate data is sent to any server
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
Cert Decoder's answer:
Simple, fast, and reliable. Some similar tools can’t even decode basic certificates. I rigorously tested my tool with many real-world certificates and covered several edge cases where competitors fall short.
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
Share your experience with using OpenSMTPD and Cert Decoder. For example, how are they different and which one is better?
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.
We have no reviews of Cert Decoder yet. Be the first one to post
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 / about 5 years ago
Why? Because I built certdecoder.com and couldn’t find a decent place to submit it. So I said screw it — I’ll build my own. With blackjack and hookers. - Source: dev.to / over 1 year ago
When comparing OpenSMTPD and Cert Decoder, you can also consider the following products.

Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
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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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The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open...
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sSMTP is a simple MTA to deliver mail from a computer to a mail server.
Compare sSMTP to OpenSMTPD or Cert Decoder: