Python收到邮件转发的实现

1. 整体流程

下面是实现"Python收到邮件转发"的整体流程：

步骤 描述
步骤1 连接到邮件服务器
步骤2 检查是否有新邮件
步骤3 如果有新邮件，将邮件转发到指定的邮箱
步骤4 重复步骤2和步骤3，直到没有新邮件
步骤5 断开与邮件服务器的连接

2. 代码实现

步骤1: 连接到邮件服务器

import imaplib

# 邮件服务器的地址和端口
mail_server = 'mail.example.com'
mail_port = 993

# 邮箱的用户名和密码
username = 'your_username'
password = 'your_password'

# 连接到邮件服务器
mail = imaplib.IMAP4_SSL(mail_server, mail_port)
mail.login(username, password)

步骤2: 检查是否有新邮件

# 选择邮箱文件夹
mail.select('INBOX')

# 搜索未读邮件
status, response = mail.search(None, 'UNSEEN')

# 获取邮件ID列表
email_ids = response[0].split()

步骤3: 邮件转发

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

# 邮件转发的目标邮箱
target_email = 'target@example.com'

# 遍历每个未读邮件并转发
for email_id in email_ids:
    # 获取邮件内容
    status, response = mail.fetch(email_id, '(RFC822)')
    raw_email = response[0][1]
    
    # 创建邮件对象
    email = MIMEMultipart()
    email.attach(MIMEText(raw_email, 'plain'))
    email['From'] = username
    email['To'] = target_email
    email['Subject'] = 'Forwarded Email'

    # 发送邮件
    smtp_server = 'smtp.example.com'
    smtp_port = 587
    smtp_username = 'your_smtp_username'
    smtp_password = 'your_smtp_password'

    smtp = smtplib.SMTP(smtp_server, smtp_port)
    smtp.starttls()
    smtp.login(smtp_username, smtp_password)
    smtp.sendmail(username, target_email, email.as_string())
    smtp.quit()

步骤4: 重复步骤2和步骤3

# 断开与邮件服务器的连接
mail.logout()

完整代码实现

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

# 邮件服务器的地址和端口
mail_server = 'mail.example.com'
mail_port = 993

# 邮箱的用户名和密码
username = 'your_username'
password = 'your_password'

# 邮件转发的目标邮箱
target_email = 'target@example.com'

# 连接到邮件服务器
mail = imaplib.IMAP4_SSL(mail_server, mail_port)
mail.login(username, password)

# 选择邮箱文件夹
mail.select('INBOX')

# 搜索未读邮件
status, response = mail.search(None, 'UNSEEN')

# 获取邮件ID列表
email_ids = response[0].split()

# 遍历每个未读邮件并转发
for email_id in email_ids:
    # 获取邮件内容
    status, response = mail.fetch(email_id, '(RFC822)')
    raw_email = response[0][1]
    
    # 创建邮件对象
    email = MIMEMultipart()
    email.attach(MIMEText(raw_email, 'plain'))
    email['From'] = username
    email['To'] = target_email
    email['Subject'] = 'Forwarded Email'

    # 发送邮件
    smtp_server = 'smtp.example.com'
    smtp_port = 587
    smtp_username = 'your_smtp_username'
    smtp_password = 'your_smtp_password'

    smtp = smtplib.SMTP(smtp_server, smtp_port)
    smtp.starttls()
    smtp.login(smtp_username, smtp_password)
    smtp.sendmail(username, target_email, email.as_string())
    smtp.quit()

# 断开与邮件服务器的连接
mail.logout()

3. 序列图

下面是实现"Python收到邮件转发"的序列图：

sequenceDiagram
    participant Developer
    participant MailServer
    participant SMTPServer