├── .gitignore
├── README.md
├── composer.json
└── outlandish-smtp.php


/.gitignore:
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1 | .idea
2 | 


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/README.md:
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1 | # outlandish-smtp
2 | Provides a number of different ways to set how WordPress sends emails
3 | 


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/composer.json:
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 1 | {
 2 |   "name": "outlandish/outlandish-smtp",
 3 |   "type": "wordpress-muplugin",
 4 |   "description": "Provides a number of different ways to set how WordPress sends emails",
 5 |   "license": "MIT",
 6 |   "version": "1.1.2",
 7 |   "authors": [
 8 |     {
 9 |       "name": "Nick Sellen",
10 |       "email": "nick@outlandish.com"
11 |     },
12 |     {
13 |       "name": "Matt Kendon",
14 |       "email": "matt@outlandish.com"
15 |     }
16 |   ],
17 |   "keywords": [
18 |     "wordpress",
19 |     "smtp",
20 |     "wp",
21 |     "plugin"
22 |   ]
23 | }
24 | 


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/outlandish-smtp.php:
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  1 | <?php
  2 | /**
  3 |  * Plugin Name: Outlandish SMTP Plugin
  4 |  * Plugin URI: https://outlandish.com/
  5 |  * Description: Provides a number of different ways to set how WordPress sends emails
  6 |  * Version: 1.1.2
  7 |  * Author: Outlandish
  8 |  * Author URI: https://outlandish.com/
  9 |  * License: MIT License
 10 |  */
 11 | 
 12 | function getEnvValue($name)
 13 | {
 14 |     return $_ENV[$name] ?? getenv($name);
 15 | }
 16 | 
 17 | if (getEnvValue('SES_SMTP_USER') && getEnvValue('SES_SMTP_PASS')) {
 18 |     // Send using SES
 19 | 
 20 |     $user = getEnvValue('SES_SMTP_USER');
 21 |     $pass = getEnvValue('SES_SMTP_PASS');
 22 |     $port = getEnvValue('SES_SMTP_PORT') ?: '587';
 23 |     $host = getEnvValue('SES_SMTP_HOST') ?: 'email-smtp.eu-west-1.amazonaws.com';
 24 | 
 25 |     add_action('phpmailer_init', function ($phpmailer) use ($user, $pass, $host, $port) {
 26 |         $phpmailer->isSMTP();
 27 |         $phpmailer->Host     = $host;
 28 |         $phpmailer->SMTPAuth = true;
 29 |         $phpmailer->Port     = $port;
 30 |         $phpmailer->Username = $user;
 31 |         $phpmailer->Password = $pass;
 32 |     });
 33 | } elseif (getEnvValue('MAILTRAP_USER') && getEnvValue('MAILTRAP_PASS')) {
 34 |     // Use mailtrap
 35 | 
 36 |     $user = getEnvValue('MAILTRAP_USER');
 37 |     $pass = getEnvValue('MAILTRAP_PASS');
 38 | 
 39 |     add_action('phpmailer_init', function ($phpmailer) use ($user, $pass) {
 40 |         $phpmailer->isSMTP();
 41 |         $phpmailer->Host = 'smtp.mailtrap.io';
 42 |         $phpmailer->SMTPAuth = true;
 43 |         $phpmailer->Port = 2525;
 44 |         $phpmailer->Username = $user;
 45 |         $phpmailer->Password = $pass;
 46 |     });
 47 | } elseif (getEnvValue('SMTP_HOST')) {
 48 |     // Use SMTP_* env variables
 49 | 
 50 |     $host = getEnvValue('SMTP_HOST');
 51 |     $port = getEnvValue('SMTP_PORT') ?: '25';
 52 |     $secure = getEnvValue('SMTP_SECURE') ?: '';
 53 |     $user = getEnvValue('SMTP_USER');
 54 |     $pass = getEnvValue('SMTP_PASS');
 55 | 
 56 |     add_action('phpmailer_init', function ($phpmailer) use ($user, $pass, $host, $port, $secure) {
 57 |         $phpmailer->isSMTP();
 58 |         $phpmailer->Host       = $host;
 59 |         $phpmailer->Port       = $port;
 60 |         $phpmailer->SMTPSecure = $secure;
 61 |         if ($user && $pass) {
 62 |             $phpmailer->SMTPAuth = true;
 63 |             $phpmailer->Username = $user;
 64 |             $phpmailer->Password = $pass;
 65 |         }
 66 |     });
 67 | }
 68 | 
 69 | /**
 70 |  * Filters out the MIME-Version header. It is already added by PHPMailer, and mails with
 71 |  * duplicate headers are rejected by AWS SES.
 72 |  **/
 73 | add_filter('wp_mail', function ($args) {
 74 |     $headers = $args['headers'];
 75 |     if (empty($headers) || is_array($headers)) {
 76 |         return $args;
 77 |     }
 78 |     $headers = preg_split('#\r?\n#', $headers);
 79 |     $headers = array_filter($headers, function ($header) {
 80 |         $header = trim($header);
 81 |         if (empty($header)) {
 82 |             return false;
 83 |         }
 84 |         $key = strtolower(explode(':', $header)[0]);
 85 |         // PHPMailer adds this header; duplicate headers are rejected by AWS SES
 86 |         if ($key === 'mime-version') {
 87 |             return false;
 88 |         }
 89 |         return true;
 90 |     });
 91 |     $args['headers'] = $headers;
 92 |     return $args;
 93 | });
 94 | 
 95 | // changes what the wp_mail from address is if the constant is set
 96 | add_filter("wp_mail_from", function ($original_email_address) {
 97 |     $from_email = getEnvValue('FROM_EMAIL_ADDRESS');
 98 |     return $from_email ?: $original_email_address;
 99 | });
100 | 
101 | // changes what the wp_mail from name is if the constant is set
102 | add_filter("wp_mail_from_name", function ($original_from_name) {
103 |     $from_name = getEnvValue('FROM_EMAIL_NAME');
104 |     return $from_name ?: $original_from_name;
105 | });
106 | 
107 | add_action('wp_mail_failed', function ($wp_error) {
108 |     /** @var WP_Error $wp_error */
109 |     error_log('Mail Failed: ' . $wp_error->get_error_message());
110 | });
111 | 


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