<form action="">
    <div>
        <input type="text" placeholder="Enter your email..." name="sender_mail">
        <textarea rows="10" cols="45" name="text_message" placeholder="Your text here..."></textarea>
        <input type="button" onclick="message.py" value="Send message">
    </div>
</form>

import smtplib
import cgi
form = cgi.FieldStorage()
if form.getvalue("text_message"):
    mes = form.getvalue("text_message")

if form.getvalue("sender_mail"):
    sent = form.getvalue("sender_mail")
message = mes+" "+sent
mail = smtplib.SMTP("smtp.mail.ru", 587)
mail.ehlo()
mail.starttls()
mail.login('sender@mail.ru', 'senderspassword')
mail.sendmail('sender@mail.ru', 'tech_support@mail.ru', message)
mail.close()

<script type="text/python">
</script>