This was never intended by all published SPF drafts since 2003, and for an unknown large number of v=spf1 policies an evaluation for pra could cause bogus results for many cases where pra and mfrom are different.
这在2003年以来发布的所有SPF草案中从未考虑，并且对于未知的大量v=spf1策略、同时有pra和mfrom且不同的许多情况，对pra的评估可能导致错误的结果。