Need help creating a python loop

I am fairly new to python and need help making my email sender a loop. I want the code to loop so that I can enter multiple emails while bypassing the email password (after the first execution).

Here is my code:

import smtplib, ssl
from email.message import EmailMessage
port = 465
password = input('Type your password and press enter: ')
sender = 'email@gmail.com'
receiver = input('Enter the email you wish to receive the message and press enter: ')

subject = "Thank you!"
body = """
asdfgh

"""

em = EmailMessage()
em['From'] = sender
em['To'] = receiver
em['Subject'] = subject
em.set_content(body)

context = ssl.create_default_context()
with smtplib.SMTP_SSL('smtp.gmail.com', port, context=context) as server:
    server.login(sender, password)
    server.sendmail(sender, receiver, em.as_string())

print('Email sent!')

I do not know where to start. I only know the very basics of the for loop.

Here is a very simple example of how you could input strings in a loop:

receivers = []
while not receivers or receivers[-1]:
    receivers.append(input(
        'Enter the email you wish to receive the message and press enter: '
    ))
receivers.pop()

This while loop will continue while the list is empty (not receivers) or the last element of the list (receivers[-1]) is not empty. That means that it will keep prompting you for input until you enter an empty string.

After the loop is done, receivers.pop() will pop off the last element of the list (the empty string you entered to terminate the loop).

Once you have the list, you might want to turn it into a single string using str.join, e.g.:

em['To'] = ','.join(receivers)