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OpenSMTPD VS CMail

Compare OpenSMTPD VS CMail and see what are their differences

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OpenSMTPD logo OpenSMTPD

OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...

CMail logo CMail

CMail is a free Windows command line mailer with advanced message formatting options.
  • OpenSMTPD Landing page
    Landing page //
    2019-03-05
  • CMail
    Image date //
    2024-03-09

CMail is a command line e-mail sending tool. It was originally developed to assist with testing mail server and content analysis software. As a result, CMail provides many more message formatting and SMTP session control options than similar software.

Features

  • Flexible configuration via files or the command line and optional GUI provided by CMailGUI.
  • TLS/SSL (including TLS 1.3) via STARTTLS or SMTPS (SSL-enabled version). Built-in, stunnel not required.
  • Support for adding multipart/alternative HTML message bodies (UTF-8) and embedded images.
  • SMTP authentication using CRAM-MD5, PLAIN, LOGIN, OAUTHBEARER and XOAUTH2.
  • Unlimited attachments using base64, quoted printable or uuencoding.
  • Wildcard attachment support to attach directory content.
  • Unlimited To/Cc/Bcc recipients, with aliases and DSN options for each if desired.
  • Message bodies using plain text, base64, or quoted printable encoding.
  • IPv6 support.
  • DKIM signing (RSA and Ed25519).
  • Delivery Status Notification and Message Disposition Notification (Read receipt) support.
  • Read message body from command line, stdin or file.
  • Sending via SOCKS or HTTPS proxies.
  • Works with GMail using App Passwords or user-supplied OAUTHBEARER/XOAUTH2 tokens.
  • Written entirely in C - no need for .NET libraries, Java, or other prerequisites.
  • No installation required. Download, extract, use.
  • Free for private and commercial use.

OpenSMTPD

Website
opensmtpd.org
$ Details
Platforms
-
Release Date
-
Edit details

CMail

Website
inveigle.net
$ Details
free
Platforms
Windows
Release Date
2006 January
Edit details

OpenSMTPD videos

+ Add

DAY[0] Episode #31 - kr00k, GhostCat, and more issues from NordVPN, Samsung, OpenSMTPd

CMail videos

No CMail videos yet. You could help us improve this page by suggesting one.

+ Add video

Category Popularity

0-100% (relative to OpenSMTPD and CMail)

OpenSMTPD

CMail

SMTP Server
47 47%
SMTP Server
53% 53
Email
46 46%
Email
54% 54
MTA
50 50%
MTA
50% 50
Email Delivery
100 100%
Email Delivery
0% 0

User comments

Share your experience with using OpenSMTPD and CMail. For example, how are they different and which one is better?
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Reviews

These are some of the external sources and on-site user reviews we've used to compare OpenSMTPD and CMail

OpenSMTPD Reviews

Best Free and Open Source Alternatives to Microsoft Exchange Server
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.
Source: www.linuxlinks.com

CMail Reviews

We have no reviews of CMail yet.
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Social recommendations and mentions

Based on our record, OpenSMTPD seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

OpenSMTPD mentions (2)

  • Has anyone setup a Linux based internal only smtp relay?
    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 derivatives. I use it in my environment on OpenBSD. Source: about 1 year ago
  • DKIM Migration: Rpamd instead of DKIMproxy out on OpenBSD / OpenSMTPD
    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 / almost 3 years ago

CMail mentions (0)

We have not tracked any mentions of CMail yet. Tracking of CMail recommendations started around Mar 2021.

What are some alternatives?

When comparing OpenSMTPD and CMail, you can also consider the following products

Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

blat - Blat is a small, efficent SMTP command line mailer for Windows.

sSMTP - sSMTP is a simple MTA to deliver mail from a computer to a mail server.

mailsend-go - mailsend-go is a command line tool to send mail via SMTP protocol, written with golang.

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

sendEmail - sendEmail is a lightweight, command line SMTP email client.

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