Mail MCP Server

Instructions

Implementation Reference

• src/mail_mcp/smtp/operations/send.py:46-158 (handler)

  The core logic for sending emails, including parameter validation, email construction, and actual SMTP transmission.

  def send_email(
      client,
      to: list[str],
      subject: str,
      body_text: str | None = None,
      body_html: str | None = None,
      cc: list[str] | None = None,
      bcc: list[str] | None = None,
      attachments: list[Attachment] | None = None,
      from_addr: str | None = None,
  ) -> SendResult:
      """
      发送邮件
  
      Args:
          client: SMTP 客户端对象
          to: 收件人列表 (必填)
          subject: 主题 (必填)
          body_text: 纯文本正文
          body_html: HTML 正文
          cc: 抄送列表
          bcc: 密送列表
          attachments: 附件列表
          from_addr: 发件人地址
  
      Returns:
          SendResult: 发送结果
      """
      # 1. 验证参数
      if not to:
          return SendResult(success=False, error="收件人列表不能为空")
  
      if not subject:
          return SendResult(success=False, error="邮件主题不能为空")
  
      if not body_text and not body_html:
          return SendResult(success=False, error="邮件正文不能为空")
  
      # 验证邮箱地址
      for addr in to:
          if not validate_email_address(addr):
              return SendResult(success=False, error=f"无效的收件人地址: {addr}")
  
      if cc:
          for addr in cc:
              if not validate_email_address(addr):
                  return SendResult(success=False, error=f"无效的抄送地址: {addr}")
  
      if bcc:
          for addr in bcc:
              if not validate_email_address(addr):
                  return SendResult(success=False, error=f"无效的密送地址: {addr}")
  
      try:
          # 获取发件人地址
          if not from_addr:
              if hasattr(client, "config") and hasattr(client.config, "user"):
                  from_addr = client.config.user
              else:
                  return SendResult(success=False, error="缺少发件人地址")
  
          # 2. 构建邮件消息
          message = build_email_message(
              sender=from_addr,
              to=to,
              subject=subject,
              body_text=body_text,
              body_html=body_html,
              cc=cc,
              bcc=bcc,
              attachments=attachments,
          )
  
          # 生成 Message-ID
          message_id = make_msgid()
          message["Message-ID"] = message_id
  
          # 3. 获取所有收件人
          all_recipients = to.copy()
          if cc:
              all_recipients.extend(cc)
          if bcc:
              all_recipients.extend(bcc)
  
          # 4. 发送邮件
          smtp = _get_smtp_client(client)
  
          # 确保连接已建立
          if smtp is None:
              # 尝试连接
              if hasattr(client, "connect"):
                  client.connect()
                  smtp = _get_smtp_client(client)
  
          if smtp is None:
              return SendResult(success=False, error="无法获取 SMTP 连接")
  
          smtp.send_message(message, from_addr=from_addr, to_addrs=all_recipients)
  
          return SendResult(success=True, message_id=message_id, rejected=None)
  
      except smtplib.SMTPAuthenticationError as e:
          return SendResult(success=False, error=f"认证失败: {str(e)}")
      except smtplib.SMTPSenderRefused as e:
          return SendResult(success=False, error=f"发件人被拒绝: {str(e)}")
      except smtplib.SMTPRecipientsRefused as e:
          rejected = list(e.recipients.keys())
          return SendResult(success=False, error=f"收件人被拒绝: {str(e)}", rejected=rejected)
      except smtplib.SMTPException as e:
          return SendResult(success=False, error=f"SMTP 错误: {str(e)}")
      except Exception as e:
          return SendResult(success=False, error=f"发送失败: {str(e)}")