Bugfixes made on the interface

src/Email/MailerInterface.php

@@ -8,5 +8,7 @@ interface MailerInterface
     
     public function setFrom($from) : self;
     
+    public function attach(\Swift_Attachment $attachment) : self;
+
     public function setTo($to) : self;
 }

src/Email/SwiftMailer.php

@@ -16,6 +16,8 @@ class SwiftMailer implements MailerInterface
     
     protected /*stringable|array*/ $bcc;
 
+    protected array $attachments = [];
+    
     public function __construct(EmailConfiguration $configuration) {
         $this->emailConfiguration = $configuration;
         
@@ -33,9 +35,22 @@ class SwiftMailer implements MailerInterface
             ->setBCC($this->bcc ?? [])
             ->setBody( $message, $html ? 'text/html' : 'text/plain' );
 
+        foreach ($this->attachments as $attachment) {
+            $swiftObj->attach($attachment);
+        }
+
+        $this->attachments = [];
+
         return ( new \Swift_Mailer($this->transport) )->send($swiftObj);
     }
 
+    public function attach(\Swift_Attachment $attachment) : self
+    {
+        $this->attachments[] = $attachment;
+
+        return $this;
+    }
+    
     public function setFrom(/*stringable|array*/ $from) : MailerInterface
     {
         $this->from = $from;