没有MX记录在一个可能的钓鱼域？

Question

我在我的SMTP日志上看到，它询问一个可能的钓鱼域，我查找它的MX记录，但它没有。在发送网络钓鱼邮件之前，域名是否需要MX记录？

Answer 1

在发送网络钓鱼邮件之前，域名是否需要MX记录？

不是的。根据RFC 2821的说法，如果没有MX记录，那么邮件传递将查找A记录，而不是：

The lookup first attempts to locate an MX record associated 
with the name.  If a CNAME record is found instead, the 
resulting name is processed as if it were the initial name.  
If no MX records are found, but an A RR is found, the A RR 
is treated as if it was associated with an implicit MX RR, 
with a preference of 0, pointing to that host.