input: Write a python function to send an email with given subject, body, sender, and receivers using smtplib.
  assert send_email("Test Subject", "Test Body", "from@fromdomain.com", ["to@todomain.com"]) == "Email sent successfully"
  assert send_email("Hello", "This is a test", "sender@example.com", ["receiver@example.com"]) == "Email sent successfully"
  assert send_email("Greetings", "Welcome to the team", "team@company.com", ["newmember@company.com"]) == "Email sent successfully"
output: import smtplib
  from email.mime.text import MIMEText
  from email.mime.multipart import MIMEMultipart
  
  def send_email(subject, body, sender, receivers):
      try:
          # Create the email header
          message = MIMEMultipart()
          message['From'] = sender
          message['To'] = ", ".join(receivers)
          message['Subject'] = subject
          
          # Attach the body with the msg instance
          message.attach(MIMEText(body, 'plain'))
  
          # Create SMTP session for sending the mail
          server = smtplib.SMTP('smtp.example.com', 587)  # Use appropriate SMTP server and port
          server.starttls()  # Enable security
          server.login(sender, 'your_password')  # Login with your credentials
  
          # Send the email
          server.sendmail(sender, receivers, message.as_string())
          server.quit()
  
          return "Email sent successfully"
      except Exception as e:
          return f"Failed to send email: {str(e)}"