Python スクリプトで電子メールの存在を確認することは可能ですか?

import smtplib
import imaplib
import email

def verify_email(email_address):
    # Set up SMTP server and email
    smtp_server = 'your_smtp_server'
    sender_email = '[email protected]'
    sender_password = 'your_email_password'

    # Connect to SMTP server
    server = smtplib.SMTP(smtp_server, 587)
    server.starttls()
    server.login(sender_email, sender_password)

    # Try sending an email
    try:
        server.sendmail(sender_email, email_address, "This is a test message.")
    except smtplib.SMTPRecipientsRefused:
        # If recipient is refused, the email doesn't exist
        print(f"The email address '{email_address}' does not exist.")
        return False
    except smtplib.SMTPServerDisconnected:
        print("SMTP Server Disconnected.")
        return False
    except Exception as e:
        print(f"An error occurred: {e}")
        return False

    # Close SMTP connection
    server.quit()

    # Check for bounce-back message
    mail = imaplib.IMAP4_SSL('imap.example.com')
    mail.login(sender_email, sender_password)
    mail.select('inbox')
    result, data = mail.search(None, 'ALL')
    latest_email_id = data[0].split()[-1]

    # Fetch and parse latest email
    result, data = mail.fetch(latest_email_id, "(RFC822)")
    raw_email = data[0][1]
    msg = email.message_from_bytes(raw_email)

    # Check if the email was bounced back
    if "Mail Delivery Subsystem" in msg["From"] or "Undelivered Mail Returned to Sender" in msg["Subject"]:
        print(f"The email address '{email_address}' does not exist.")
        return False
    else:
        print(f"The email address '{email_address}' exists.")
        return True

if __name__ == "__main__":
    email_to_verify = input("Enter the email address to verify: ")
    verify_email(email_to_verify)