added upgrade-v4-to-v5 page

docs/book/v5/upgrade-v4-to-v5.md

@@ -0,0 +1,118 @@
+# How to update `dotkernel/dot-mail` from v3/v4 to v5 in your projects
+
+- The first thing to do is download the new [mail configuration file](https://github.com/dotkernel/dot-mail/blob/5.0/config/mail.global.php.dist).
+- Add the values you configured for your project, focusing on `transport`, `message_options` and `smtp_options`, then replace your old configuration file.
+- In your `composer.json` update `"dotkernel/dot-mail": "^5.0.0",` and run `composer update` in the command line.
+
+At this moment, `mime` and `imap` related functionality is removed.
+
+## Technical approach
+
+You can follow all the changes in this list of PRs:
+
+- [dot-mail PR 65](https://github.com/dotkernel/dot-mail/pull/65/files)
+- [dot-mail PR 66](https://github.com/dotkernel/dot-mail/pull/66/files)
+- [dot-mail PR 67](https://github.com/dotkernel/dot-mail/pull/67/files)
+- [dot-mail PR 69](https://github.com/dotkernel/dot-mail/pull/69/files)
+
+> Function definition changes will not be covered in this article.
+
+When upgrading dotkernel/dot-mail from v4 to v5, the main focus is on the configuration file `mail.global.php`.
+It was revised to implement symfony/mailer, to remove features that are no longer available and to make dotkernel/dot-mail easier to configure.
+
+```php
+?php
+
+declare(strict_types=1);
+
+return [
+    /**
+     * Dotkernel mail module configuration
+     * Note that many of these options can be set programmatically too, when sending mail messages actually that is
+     * what you'll usually do, these configs provide just defaults and options that remain the same for all mails
+     */
+    'dot_mail' => [
+        //the key is the mail service name, this is the default one, which does not extend any configuration
+        'default' => [
+            //message configuration
+            'message_options' => [
+                //from email address of the email
+                'from' => '',
+                //from name to be displayed instead of from address
+                'from_name' => '',
+                //reply-to email address of the email
+                'reply_to' => '',
+                //replyTo name to be displayed instead of the address
+                'reply_to_name' => '',
+                //destination email address as string or a list of email addresses
+                'to' => [],
+                //copy destination addresses
+                'cc' => [],
+                //hidden copy destination addresses
+                'bcc' => [],
+                //email subject
+                'subject' => '',
+                //body options - content can be plain text, HTML
+                'body' => [
+                    'content' => '',
+                    'charset' => 'utf-8',
+                ],
+                //attachments config
+                'attachments' => [
+                    'files' => [],
+                    'dir'   => [
+                        'iterate'   => false,
+                        'path'      => 'data/mail/attachments',
+                        'recursive' => false,
+                    ],
+                ],
+            ],
+            /**
+             * the mail transport to use can be any class implementing
+             * Symfony\Component\Mailer\Transport\TransportInterface
+             *
+             * for standard mail transports, you can use these aliases:
+             * - sendmail  => Symfony\Component\Mailer\Transport\SendmailTransport
+             * - esmtp     => Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport
+             *
+             * defaults to sendmail
+             **/
+            'transport' => 'sendmail',
+            //options that will be used only if esmtp adapter is used
+            'smtp_options' => [
+                //hostname or IP address of the mail server
+                'host' => '',
+                //port of the mail server - 587 or 465 for secure connections
+                'port'              => 587,
+                'connection_config' => [
+                    //the smtp authentication identity
+                    'username' => '',
+                    //the smtp authentication credential
+                    'password' => '',
+                    //to disable auto_tls set tls key to false
+                    //it's not recommended to disable TLS while connecting to an SMTP server
+                    'tls' => null,
+                ],
+            ],
+        ],
+        // option to log the SENT emails
+        'log' => [
+            'sent' => getcwd() . '/log/mail/sent.log',
+        ],
+    ],
+];
+```
+
+Make sure to use **ONE** of the below transporters, based on your server configuration.
+
+```php
+'transport' => 'sendmail',
+```
+
+OR
+
+```php
+'transport' => 'esmtp',
+```
+
+We set **Sendmail** to be the default.

mkdocs.yml

@@ -20,6 +20,7 @@ nav:
       - Configuration: v5/configuration.md
       - Usage: v5/usage.md
       - Transports: v5/transports.md
+      - Upgrade from V4 to v5: v5/upgrade-v4-to-v5.md
 site_name: dot-mail
 site_description: "Dotkernel's mail service"
 repo_url: "https://github.com/dotkernel/dot-mail"