64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
import logging
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import dns.resolver
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from django.core.cache import caches
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logger = logging.getLogger(__name__)
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default_cache = caches['default']
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MX_CACHE_TTL = 3600 # MX 验证结果缓存1小时，避免每次请求都做慢速DNS查询
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# 常用邮箱域名白名单：大概率可正常收发，直接放行，无需DNS查询
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COMMON_EMAIL_DOMAINS = {
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'qq.com', 'foxmail.com', '163.com', '126.com', 'yeah.net',
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'139.com', '189.cn', 'sina.com', 'sohu.com', '21cn.com',
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'gmail.com', 'googlemail.com', 'outlook.com', 'hotmail.com',
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'live.com', 'msn.com', 'icloud.com', 'me.com', 'yahoo.com',
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'proton.me', 'protonmail.com', 'gmx.com', 'gmx.net', 'aol.com', 'zoho.com',
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}
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def validate_email_mx(email):
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"""验证邮箱域名是否有MX记录（通过DNS MX查询），排除 null MX (MX 0 .) 的情况"""
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try:
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domain = email.split('@')[1].lower()
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except IndexError:
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return False
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# 常用邮箱域名直接放行，免DNS查询
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if domain in COMMON_EMAIL_DOMAINS:
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return True
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cache_key = f'mx_valid_{domain}'
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try:
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cached = default_cache.get(cache_key)
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if cached is not None:
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return cached
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except Exception:
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pass
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valid = _query_mx(domain)
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try:
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default_cache.set(cache_key, valid, timeout=MX_CACHE_TTL)
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except Exception:
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pass
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return valid
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def _query_mx(domain):
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try:
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answers = dns.resolver.resolve(domain, 'MX')
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# 检查是否是 null MX (MX 0 .) — 域名明确拒绝收件
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for answer in answers:
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exchange = answer.exchange.to_text().rstrip('.')
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if exchange: # 有真实的邮件服务器
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return True
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# 所有 MX 记录都指向空（null MX），表示不接受邮件
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logger.warning(f'[Email] Domain has null MX (rejects mail): {domain}')
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return False
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except (dns.resolver.NoAnswer, dns.resolver.NXDOMAIN, dns.resolver.NoNameservers):
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logger.warning(f'[Email] No MX record found for domain: {domain}')
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return False
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except Exception as e:
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logger.warning(f'[Email] MX record check failed: domain={domain}, error={str(e)}')
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return False
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