Script for sending E-Mails from Localhost for testing purposes. More (german language) at http://www.hansspiess.de/html-e-mail-entwicklung-und-testing-mit-foundation-for-emails-gmail-und-postfix/698/

mail.php

<?php 

//  get args from command line
//  http://stackoverflow.com/questions/6826718/pass-variable-to-php-script-running-from-command-line
if ( defined('STDIN') ) {
  $dir = $argv[1] ? $argv[1] : './';
  $ext = $argv[2] ? $argv[2] : 'html';
} else {
  die( 'not on a local machine.' );
}

//  set mail vars
$recipients = array( 'mail@gmail.com', 'mail@anotherservice.com', 'mail@yourdomain.com' );
$sender     = 'mail@yourdomain.com';
$reply      = 'mail@yourdomain.com';
 
$header     = 'MIME-Version: 1.0' . "\r\n";
$header    .= 'Content-type: text/html; charset=utf-8' . "\r\n";
 
$header    .= 'From: ' . $sender . "\r\n";
$header    .= 'Reply-To: ' . $reply . "\r\n";

//  loop over files in given directory:
//  http://is.php.net/manual/en/function.glob.php
foreach ( glob( $dir . '*.' . $ext ) as $file ) {

    //  set subject to a unique still readable string to be found easily in the inbox
    $subject = time() . ' ' . $file;

    //  grab content of inlined file
    $body = file_get_contents( $file );

    //  and of we go!
    foreach ( $recipients as $recipient ) {
        mail( $recipient, $subject, $body, $header );
    }

}

package.json

{
  "scripts": {
    "mail" : "php mail.php ./dist/ html"
  }
}