mail-log-and-notify.rb

#!/usr/bin/env ruby

# Reads a mail from stdin, saves it to a new timestamped file and raises
# an macOS system notification. Can be used with PHP by entering this
# scripts path as a sendmail_path PHP INI variable. If used this way,
# from a webserver PHP instalation, make sure that the _www user has
# sufficent rights to execute the script and to write to the DIR_PATH
# folder. Also note that Dir.home returns the current user’s homedir.
# That means that if run by _www, it would return /Library/WebServer.
#
# Requires mail and terminal-notifier gems to be installed.

require 'date'
require 'mail'
require 'terminal-notifier'

DIR_PATH = File.join Dir.home, 'tmp', 'sendmail'
FILE_PATH = File.join DIR_PATH,
                      "#{DateTime.now.strftime '%Y-%m-%d %H:%M:%S.%L'}.eml"

stdin = $<.read

File.new(FILE_PATH, 'w') << stdin

mail = Mail.read_from_string stdin
TerminalNotifier.notify mail.subject,
                        title: 'sendmail',
                        subtitle: "To: #{mail.to.first}",
                        open: "file://#{FILE_PATH}",
                        sender: 'com.apple.Mail'