# Subject
now = dt.datetime.now().ctime()
subject = 'Change to system on %s' % now

# Body
body = 'Subject: %s,n' % subject
body += 'On %s, a change to the system was detected. Details follow.nn' % now

relevantFiles = list(set([x.file for x in relevantChunks]))
for file in relevantFiles:

    fileChunks = [x for x in relevantChunks if x.file == file]
    for chunk in fileChunks:
        body += '****** Affected file %s. ' % chunk.file
        <some other stuff>

server = smtp.SMTP(args.host) # host = smtp.gmail.com:<port> look this bit up
server.starttls()
server.login(args.username, args.password)
server.sendmail(args.sender, args.recipient, body)
server.quit()

from email.mime.text import MIMEText
import smtplib

msg = MIMEText("Hello There!")

msg['Subject'] = 'A Test Message'
msg['From'] = 'username@gmail.com'
msg['To'] = 'username@gmail.com'

s = smtplib.SMTP('smtp.gmail.com:587')
s.starttls()  ##Must start TLS session to port 587 on the gmail server
s.login('username', 'passsword') ##Must pass args gmail username & password in quotes to authenticate on gmail
s.sendmail('username@gmail.com',['username@gmail.com'],msg.as_string())

print("Message Sent")