Fix code review issues: remove duplicate import and improve SMTP cleanup

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

pop3_forwarder.py

@@ -202,6 +202,8 @@ class EmailForwarder:
             # Send via SMTP
             self.throttle.wait_if_needed()
             
+            server = None
+            try:
                 if self.smtp_use_tls:
                     server = smtplib.SMTP(self.smtp_host, self.smtp_port)
                     server.starttls()
@@ -210,10 +212,15 @@ class EmailForwarder:
                 
                 server.login(self.smtp_user, self.smtp_password)
                 server.send_message(forward_msg)
-            server.quit()
                 
                 logger.info(f"Successfully forwarded email to {self.gmail_destination}")
                 return True
+            finally:
+                if server:
+                    try:
+                        server.quit()
+                    except Exception:
+                        pass  # Ignore errors during cleanup
             
         except Exception as e:
             logger.error(f"Error forwarding email: {e}")
@@ -228,7 +235,6 @@ class EmailForwarder:
         
         try:
             import http.client
-            import json
             
             conn = http.client.HTTPSConnection("api.postmarkapp.com")