input: Write a python function to send a personalized email to each customer from a CSV file.
  assert send_emails('customer_file.csv') == "Emails sent successfully"
  assert send_emails('non_existent_file.csv') == "File not found"
  assert send_emails('empty_file.csv') == "No customers to send emails to"
output: import csv
  import smtplib
  from email.mime.text import MIMEText
  from email.mime.multipart import MIMEMultipart
  
  def send_emails(file_path):
      try:
          with open(file_path, 'r') as file:
              reader = csv.DictReader(file)
              customers = list(reader)
              
              if not customers:
                  return "No customers to send emails to"
              
              # Assuming you have the email server details and login credentials
              smtp_server = 'smtp.example.com'
              smtp_port = 587
              smtp_user = 'your_email@example.com'
              smtp_password = 'your_password'
              
              server = smtplib.SMTP(smtp_server, smtp_port)
              server.starttls()
              server.login(smtp_user, smtp_password)
              
              for customer in customers:
                  name = customer['Name']
                  email = customer['Email']
                  
                  msg = MIMEMultipart()
                  msg['From'] = smtp_user
                  msg['To'] = email
                  msg['Subject'] = 'Personalized Email Subject'
                  
                  body = f"Dear {name},\n\nThis is a personalized message for you."
                  msg.attach(MIMEText(body, 'plain'))
                  
                  server.send_message(msg)
              
              server.quit()
              return "Emails sent successfully"
      except FileNotFoundError:
          return "File not found"