CMail Command Line Mailer

BETA testers needed for OAuth2 integration.

See CMail OAuth2 Builds if you are interested in testing CMail with OAuth2.

What is CMail? CMail is a freeware application that allows you to send e-mail from the Windows command line using SMTP. It is primarily intended for sending e-mail from batch files or other scripts/applications, but is simple enough to be used interactively. If you are looking for an alternative to Blat with SSL support (stunnel not required), CMail may be a good choice.

Note	CMail is actively maintained with new functionality added as necessary, often resulting from requests by users.

CMail was originally developed to assist with testing e-mail server and content analysis software, and as a result it includes features not found in similar tools. It doesn’t just send an e-mail - CMail gives you greater control over the SMTP session and how the message is constructed.

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 XOUATH2.
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.
Optional configuration via stdin and JSON-based output for easy integration with third-party applications.
Sending via SOCKS or HTTPS proxies.
Works with GMail using App Passwords or user-supplied OAUTHBEARER tokens.
Create and send .eml files.
Written entirely in C - no need for .NET libraries, Java, or other prerequisites.
Portable - no installation required and nothing is written to disk by default (CMailGUI can also store its configuration on a portable file system).
Free for private and commercial use.

See CMail Usage for all features.

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