smtp.py

# https://www.python.ambitious-engineer.com/archives/2034

import smtplib
from email.mime.text import MIMEText

# 送受信先
to_email = "xxxxx@gmail.com"
from_email = "xxxxx@s3.spaaqs.ne.jp"

# MIMETextを作成
message = "メール本文"
msg = MIMEText(message, "html")
msg["Subject"] = "mail from python"
msg["To"] = to_email
msg["From"] = from_email

# サーバを指定する1
host = 'ingage.sakura.ne.jp'
port = 587
user = "userid here"
password = 'password here'

# サーバを指定する2
#host = 'smtp.spaaqs.ne.jp'
#port = 587
#user = "userid here"
#password = 'password here'

server = smtplib.SMTP(host, port)
if server.has_extn('STARTTLS'):
    server.starttls()
server.set_debuglevel(True)
server.login(user, password)

# メールを送信する
server.send_message(msg)
# 閉じる
server.quit()