Python 3 Script to Send Mail via Gmail

def emailsend(subject_part, message_part):
    # usage: emailsend("Server is up", "")
    import time
    import smtplib
    import socket

    from datetime import datetime
    current_utc = datetime.utcnow().isoformat() + 'Z'

    ####--[CONFIGURATION]
    server = 'smtp.gmail.com'
    server_port = '587'
    username = 'INSERT-YOUR-USERNAME@gmail.com'
    password = 'INSERT-YOUR-PASSWORD'
    hostname = socket.gethostname()

    from_addr = 'INSERT-YOUR-FROM-NAME <INSERT-YOUR-FROM@gmail.com>'
    to_addr = 'INSERT-YOUR-TO-EMAIL'
    subject = 'INSERT-YOUR-SUBJECT-PREPEND | ' + hostname + ' | ' + subject_part
    message = 'INSERT-YOUR-MESSAGE-PREPEND | ' + hostname + ' | <br>' + message_part + '<br><br><br>Email Generated On (UTC): ' + current_utc
    ####--[/CONFIGURATION]

    headers = [
            "Subject: " + subject,
            "From: " + from_addr,
            "To: " + to_addr,
            "MIME-Version: 1.0",
            "Content-Type: text/html"
            ]
    headers = "\r\n".join(headers)

    server = smtplib.SMTP(server + ":" + server_port)
    server.ehlo()
    server.starttls()
    server.ehlo()
    server.login(username,password)
    server.sendmail(from_addr, to_addr, headers + "\r\n\r\n" + message)
    server.quit()