spf 记录参数 "all" 等于“+all”？

Question

我需要解析 spf 记录。请指教v=spf1 all和v=spf1 +all是什么意思？允许这样的语法吗？

Answer 1

是的。 RFC7208 section 4.6.2 关于限定符的说法：

The possible qualifiers, and the results they cause check_host() to
return, are as follows:
  "+" pass
  "-" fail
  "~" softfail
  "?" neutral
The qualifier is optional and defaults to "+".

spf 记录参数 "all" 等于“+all”？

spf record paramenter "all" equals to "+all"?

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