refactor(mail): correct SMTP defaults and config handling (#1772)

Author: xHeaven

packages/mail/src/Attachment.php

@@ -61,7 +61,7 @@ public static function fromFilesystem(string $path, ?string $name = null, ?strin
         $path = Path\normalize($path);
 
         if (! Filesystem\is_file($path)) {
-            throw new FileAttachmentWasNotFound($path);
+            throw FileAttachmentWasNotFound::forFilesystemFile($path);
         }
 
         return new self(

packages/mail/src/Transports/Postmark/PostmarkConfig.php

@@ -53,7 +53,7 @@ public function __construct(
     public function createTransport(): TransportInterface
     {
         return new PostmarkTransportFactory()->create(new Dsn(
-            scheme: PostmarkConnectionScheme::API->value,
+            scheme: $this->scheme->value,
             host: $this->host ?? 'default',
             user: $this->key,
             port: $this->port,

packages/mail/src/mail.config.php

@@ -20,7 +20,7 @@
         'smtps' => SmtpScheme::SMTPS,
         'smtp' => SmtpScheme::SMTP,
     },
-    host: env('MAIL_SMTP_HOST', default: '127.0.0.0'),
+    host: env('MAIL_SMTP_HOST', default: '127.0.0.1'),
     port: env('MAIL_SMTP_PORT', default: 2525),
     username: env('MAIL_SMTP_USERNAME', default: ''),
     password: env('MAIL_SMTP_PASSWORD', default: ''),