import os
import smtplib

def send_mail(email_from, email_to, subject, body):
    smtp_address = os.environ['SMTP_ADDRESS']
    provider_username = os.environ['PROVIDER_USERNAME']
    provider_password = os.environ['PROVIDER_PASSWORD']

    smtpserver = smtplib.SMTP(smtp_address, 587)
    smtpserver.ehlo()
    smtpserver.starttls()
    smtpserver.ehlo() # extra characters to permit edit
    smtpserver.login(provider_username, provider_password)
    header = 'To: ' + email_to + '\n' + 'From: ' + email_from + '\n' + 'Subject: ' + subject + '\n'
    msg = header + '\n ' + body + ' \n\n'
    smtpserver.sendmail(provider_username, email_to, msg)
    smtpserver.quit()

def lambda_handler(event, context):
    email_from = os.environ['EMAIL_FROM']
    email_to = os.environ['EMAIL_TO']
    subject = os.environ['SUBJECT']
    body = os.environ['BODY']

    send_mail(email_from, email_to, subject, body)
    return