Sndmail - a sendmail emulator

Sndmail is a multi-platform sendmail emulator and drop-in replacement for *nix-like platforms.

It was created primarily for use in Docker containers. Whilst there are many different sendmail emulators available, most lack working sendmail -bs functionality (running SMTP on standard input) which is now the default with Symfony mail.

Features

• Static drop-in replacement for sendmail
• Configurable SMTP relay server, STARTTLS with PLAIN, LOGIN and CRAM-MD5 support
• SMTP on standard input (sendmail -bs)
• Auto-generates (if missing from input) Message-Id, From & Date headers

Installation

• Static binaries can be found on the releases
• Copy or symlink the sndmail executable from /usr/sbin/sendmail
• Copy the sndmail.conf.example to /etc/sndmail.conf making any necessary edits to adjust to your SMTP relay server

Install via bash script (Linux & Mac)

Warning: This will delete any existing /usr/sbin/sendmail!

Linux & Mac users can install it directly via:

sudo bash < <(curl -sL https://raw.githubusercontent.com/axllent/sndmail/develop/install.sh)