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python自动发送邮件

  • 2026-02-26 00:53:16
python自动发送邮件

哎我跟你说哈,python 自动发邮件这玩意儿,我第一次用不是啥“写个脚本多优雅”那种场景,是半夜两点线上报警炸了,群里一堆人@我,说“你那服务又挂了?”我人都没醒透,手边只有一台破电脑……然后我就想,别在群里刷屏了,直接把异常汇总发到邮箱,老板第二天一看邮件主题就知道谁该挨骂,欸不是,谁该修锅对吧。

当时踩的坑也挺像你们平时踩默认配置的坑:你以为“默认就能跑”,结果一到生产环境就开始抽风,比如端口、TLS、超时、编码、附件大小……反正就是那种,平时测试发一封邮件好好的,一到高峰期就卡住线程不动了,跟“连接池默认10个”那味儿很像。

我一般就用标准库 smtplib + email.message,别整太花,能跑最重要。下面这段是我自己常用的骨架,写得有点啰嗦是故意的,线上出问题你至少能看日志定位到哪一步卡了。

import os
import ssl
import smtplib
import socket
import time
from email.message import EmailMessage
from email.utils import formatdate, make_msgid

defsend_mail(
    subject: str,
    text: str,
    to_addrs: list[str],
    html: str | None = None,
    attachments: list[tuple[str, bytes, str]] | None = None,  # (filename, content, mime)
    max_retry: int = 3,
)
:

"""
    attachments: e.g. [("error.log", b"...", "text/plain")]
    mime: like "text/plain" or "application/octet-stream"
    """

    host = os.getenv("SMTP_HOST""")
    port = int(os.getenv("SMTP_PORT""465"))  # 465 SSL, 587 STARTTLS
    user = os.getenv("SMTP_USER""")
    password = os.getenv("SMTP_PASS""")

ifnot (host and user and password):
raise RuntimeError("SMTP config missing, set SMTP_HOST/SMTP_USER/SMTP_PASS")

    msg = EmailMessage()
    msg["Subject"] = subject
    msg["From"] = user
    msg["To"] = ", ".join(to_addrs)
    msg["Date"] = formatdate(localtime=True)
    msg["Message-ID"] = make_msgid()

# 正文:先放纯文本,HTML可选
    msg.set_content(text)
if html:
        msg.add_alternative(html, subtype="html")

# 附件
if attachments:
for filename, content, mime in attachments:
            maintype, subtype = (mime.split("/"1) + ["octet-stream"])[:2]
            msg.add_attachment(content, maintype=maintype, subtype=subtype, filename=filename)

# 这块我就很“土”,直接重试+退避,别怕丑,救命
    last_err = None
for i in range(1, max_retry + 1):
try:
            timeout = 15
            socket.setdefaulttimeout(timeout)

if port == 465:
                context = ssl.create_default_context()
with smtplib.SMTP_SSL(host, port, context=context, timeout=timeout) as server:
                    server.login(user, password)
                    server.send_message(msg)
else:
# 587: 先连再 starttls
with smtplib.SMTP(host, port, timeout=timeout) as server:
                    server.ehlo()
                    server.starttls(context=ssl.create_default_context())
                    server.ehlo()
                    server.login(user, password)
                    server.send_message(msg)

return# 成功就走
except Exception as e:
            last_err = e
# 简单退避:1s, 2s, 4s...
            time.sleep(2 ** (i - 1))

raise RuntimeError(f"send mail failed after {max_retry} retries: {last_err}")

你看哈,这里面我故意没把“收件人”写成字符串单个参数,因为真实业务里经常是:报警发给当班同学,日报发给领导,账单发给客户,收件人列表不一样,最后你会感谢自己当初没偷懒。

然后再说几个“看起来小、出事要命”的点,我都是被锤过的:

1)账号密码:现在很多邮箱不是“登录密码”就能 SMTP,得用“授权码/应用专用密码”。你别问我怎么知道的,我当时登录成功率 0%,还以为是我代码写错了……结果是账号策略。 2)主题和正文编码:EmailMessage 默认能处理 UTF-8,别自己去拼 MIME,越拼越像 TCP 拆包那种诡异问题,一字节错位你就找半天。 3)超时:别不设,真的。你一旦把“发邮件”塞到主线程里,SMTP 卡住就跟接口超时那种血案一样,链路上游先断开,下游还在傻跑。 4)重试:也别无限重试,最多 3 次差不多了,不然你报警没发出去,反而把 SMTP 打挂了,尴尬得一批。

最后我再塞一段“像人用的”调用方式,假设你做了个小监控:发现错误就把最近 50 行日志发出去。别笑,这种脚本真能救你命。

deftail_bytes(path: str, max_bytes: int = 20_000) -> bytes:
with open(path, "rb"as f:
        f.seek(02)
        size = f.tell()
        start = max(0, size - max_bytes)
        f.seek(start)
return f.read()

if __name__ == "__main__":
    log_content = tail_bytes("app.log")
    send_mail(
        subject="【线上报警】订单服务异常,快看啊",
        text="我这边抓到一段日志,先顶一封邮件,你们谁醒着谁处理下…\n",
        to_addrs=["oncall@example.com"],
        html="<p>别慌,我先把日志贴上。</p>",
        attachments=[("app_tail.log", log_content, "text/plain")],
    )

行了差不多就这样,我现在说着说着都困了……反正你们真要上生产,记得把 SMTP 配置放环境变量,别硬编码进仓库里,别到时候截图发群里还带密码,社死级别。欸对了我刚才是不是忘了说端口 465/587 的区别……算了你先跑起来再说。

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  1. CONNECT:[ UseTime:0.001251s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001961s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000766s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000722s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001592s ]
  6. SELECT * FROM `set` [ RunTime:0.000684s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001822s ]
  8. SELECT * FROM `article` WHERE `id` = 477010 LIMIT 1 [ RunTime:0.001201s ]
  9. UPDATE `article` SET `lasttime` = 1772266108 WHERE `id` = 477010 [ RunTime:0.012601s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000831s ]
  11. SELECT * FROM `article` WHERE `id` < 477010 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001493s ]
  12. SELECT * FROM `article` WHERE `id` > 477010 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001242s ]
  13. SELECT * FROM `article` WHERE `id` < 477010 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002745s ]
  14. SELECT * FROM `article` WHERE `id` < 477010 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.032709s ]
  15. SELECT * FROM `article` WHERE `id` < 477010 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.017502s ]
0.247337s