Python通过poplib库实现POP3邮件收取的完整流程

import poplib

# 普通连接
pop_conn = poplib.POP3("pop.example.com", 110)

# SSL 加密连接
pop_conn = poplib.POP3_SSL("pop.example.com", 995)

pop_conn.user("username@example.com")
pop_conn.pass_("password_or_token")

print(pop_conn.stat())  
# 返回 (邮件数量, 邮件总字节数)

resp, mails, octets = pop_conn.list()
print(mails)
# mails = [b'1 1024', b'2 2048', ...]

resp, lines, octets = pop_conn.retr(1)
msg_content = b"\r\n".join(lines).decode("utf-8", "ignore")

pop_conn.dele(1)  # 删除第 1 封邮件

pop_conn.quit()

import poplib
from email.parser import Parser

pop_conn = poplib.POP3_SSL("pop.qq.com")
pop_conn.user("your_email@qq.com")
pop_conn.pass_("your_auth_code")

# 邮件数量
num_messages = len(pop_conn.list()[1])
print("总邮件数:", num_messages)

# 获取最后一封邮件
resp, lines, octets = pop_conn.retr(num_messages)
msg_content = b"\r\n".join(lines).decode("utf-8", "ignore")

msg = Parser().parsestr(msg_content)
print("主题:", msg["Subject"])
print("发件人:", msg["From"])
print("收件人:", msg["To"])

pop_conn.quit()

from email.header import decode_header

for i in range(1, num_messages + 1):
    resp, lines, octets = pop_conn.retr(i)
    msg_content = b"\r\n".join(lines).decode("utf-8", "ignore")
    msg = Parser().parsestr(msg_content)

    subject, encoding = decode_header(msg["Subject"])[0]
    if isinstance(subject, bytes):
        subject = subject.decode(encoding or "utf-8", "ignore")
    print(f"[{i}] 主题: {subject}")

import os
from email import message_from_string

msg = message_from_string(msg_content)

for part in msg.walk():
    content_type = part.get_content_type()
    disposition = part.get("Content-Disposition")

    if content_type == "text/plain" and not disposition:
        body = part.get_payload(decode=True).decode("utf-8", "ignore")
        print("正文:", body)

    if disposition and "attachment" in disposition:
        filename = part.get_filename()
        if filename:
            filepath = os.path.join("downloads", filename)
            with open(filepath, "wb") as f:
                f.write(part.get_payload(decode=True))
            print("保存附件:", filepath)

import csv

rows = []
for i in range(1, num_messages + 1):
    resp, lines, octets = pop_conn.retr(i)
    msg_content = b"\r\n".join(lines).decode("utf-8", "ignore")
    msg = Parser().parsestr(msg_content)

    rows.append([i, msg.get("From"), msg.get("Subject")])

with open("emails.csv", "w", newline="", encoding="utf-8") as f:
    writer = csv.writer(f)
    writer.writerow(["ID", "From", "Subject"])
    writer.writerows(rows)