Using a dictionary to pull Email Addresses. Some key's have multiple emails, how do I send to all emails?

Using Python 2.7 on Windows 7 Platform.

I am trying to send email based on ID.
I currently have ID: Email set up in a dictionary to pull from. However some ID's have multiple emails associated. How would I set that up to send an email to each recipient. I've tried [ID]:[email, email], and it seems to only send to the first email address listed. Thanks in advance.
Dictionary creation code below.

COLS = ['rep_id', 'email', 'password']
with open('commissionrepemaillist.csv', 'r') as infile:
    email_dict = {
        row[0]: dict(zip(COLS, row)) for row in csv.reader(infile)
    }

And I'm using that to assign the variable I use to send the email

email = email_dict[ID]['email']