是要购买域名才能注册邮箱么

import tencentcloud.common.credentials as credentials
import tencentcloud.common.profile.client_profile as client_profile
import tencentcloud.common.profile.http_profile as http_profile
import tencentcloud.common.exception.tencent_cloud_sdk_exception as tcex
from tencentcloud.cns.v20180416 import cns_client, models

try:
    # 实例化认证信息
    cred = credentials.Credential("你的腾讯云SecretId", "你的腾讯云SecretKey")
    httpProfile = http_profile.HttpProfile()
    httpProfile.endpoint = "cns.tencentcloudapi.com"

    clientProfile = client_profile.ClientProfile()
    clientProfile.httpProfile = httpProfile
    client = cns_client.CnsClient(cred, "", clientProfile)

    # 查询域名列表
    req = models.DescribeDomainListRequest()
    resp = client.DescribeDomainList(req)
    print(resp.to_json_string(indent=2))

except tcex.TencentCloudSDKException as err:
    print(err)