socket邮件客户端 python

在Python中，可以使用socket库创建简单的邮件客户端，通常结合IMAP4（Internet Message Access Protocol version 4）协议来读取邮件，SMTP（Simple Mail Transfer Protocol）协议来发送邮件。以下是一个简化的示例：

import imaplib
import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

# 1. 连接IMAP服务器
def imap_login(host, user, password):
    mail = imaplib.IMAP4_SSL(host)
    mail.login(user, password)
    return mail

# 2. 检索并下载邮件
def fetch_emails(mail, mailbox='INBOX', criteria='ALL'):
    mail.select(mailbox)
    result, data = mail.uid('search', None, criteria)
    uids = data[0].split()
    for uid in uids:
        _, msg_data = mail.uid('fetch', uid, '(RFC822)')
        yield msg_data[0][1]

# 3. 发送邮件
def send_email(smtp_server, sender, receiver, subject, body, password):
    msg = MIMEMultipart()
    msg['From'] = sender
    msg['To'] = receiver
    msg['Subject'] = subject
    msg.attach(MIMEText(body, 'plain'))

    server = smtplib.SMTP(smtp_server)
    server.starttls()
    server.login(sender, password)
    text = msg.as_string()
    server.sendmail(sender, receiver, text)
    server.quit()

# 使用示例
host = "imap.example.com"
username = "your_username"
password = "your_password"

imap_mail = imap_login(host, username, password)
email_list = list(fetch_emails(imap_mail))
for msg in email_list:
    # 邮件内容处理...
send_email("smtp.example.com", "sender@example.com", "receiver@example.com",
           "邮件主题", "邮件正文", password)

# 关闭连接
imap_mail.close()
imap_mail.logout()