from random import randint
from time import sleep
import smtplib

def sendemail():
    fromaddr = 'sendemailaddress@gmail.com'
    toaddr = 'receiveemailaddress@gmail.com'
    msg = "Don't forget to check your posture. The timer was "+stringtimer+" minutes."
    subject = "sit up straight!"
    message = 'Subject: %s\n\n%s' % (subject,msg)

    username = "sendemailaddress@gmail.com"
    password = "passwordforsendemailaddress"

    server = smtplib.SMTP('smtp.gmail.com:587')
    server.starttls()
    server.login(username,password)
    server.sendmail(fromaddr, toaddr, message)
    server.quit()
    print "Email sent\n"

while True:
    timer=(randint(30,60))
    stringtimer=str(timer)
    while timer > 0:
        print(timer)
        sleep(60)
        timer -= 1

    sendemail()