# smtp_test.py
import os, smtplib, ssl
from email.message import EmailMessage
from dotenv import load_dotenv

load_dotenv(".env")

SMTP_HOST = os.getenv("SMTP_HOST", "smtp.163.com")
SMTP_USER = os.getenv("SMTP_USER")            # 必须是完整邮箱
SMTP_PASS = os.getenv("SMTP_PASSWORD")        # 163“客户端授权码”
FROM = os.getenv("MAIL_FROM", SMTP_USER)      # 建议与 SMTP_USER 相同
TO = SMTP_USER                                # 先给自己发一封

assert SMTP_USER and SMTP_PASS, "缺少 SMTP_USER/SMTP_PASSWORD 环境变量"

def make_msg():
    m = EmailMessage()
    m["Subject"] = "SMTP 测试 - 465/587"
    m["From"] = FROM
    m["To"] = TO
    m.set_content("hello from smtp_test.py")
    return m

ctx = ssl.create_default_context()

# 先 465/SSL
try:
    print(">>> try SSL 465")
    with smtplib.SMTP_SSL(SMTP_HOST, 465, context=ctx, timeout=20) as s:
        s.set_debuglevel(1)
        s.login(SMTP_USER, SMTP_PASS)
        s.send_message(make_msg())
    print("OK via 465/SSL")
except Exception as e:
    print("465 failed:", e)
    print(">>> fallback STARTTLS 587")
    with smtplib.SMTP(SMTP_HOST, 587, timeout=20) as s:
        s.set_debuglevel(1)
        s.ehlo()
        s.starttls(context=ctx)
        s.ehlo()
        s.login(SMTP_USER, SMTP_PASS)
        s.send_message(make_msg())
    print("OK via 587/STARTTLS")