I don't want to filter all their emails, since occasionally they email me with something legitimate (a non-forward).

考虑到这些邮件并非全都一无是处，我也不想把它们全部过滤掉。

youdao

"There is a legitimate debate about many of these decisions.

VOA: special.2009.01.17

Even the expulsion of Satan from heaven was not sufficient to prove beyond a shadow of a doubt the legitimate authority of God.

即使是将撒旦逐出天堂也不足以,无可置疑的证明上帝的至高权威。

耶鲁公开课 - 弥尔顿课程节选

This is still a huge question for us when we think about nation building and building new states, how to create a legitimate authority.

这对我们来说依然是个庞大的问题,当我们思考国家的建设,建设一个新的国家，如何创造合法权力。

耶鲁公开课 - 政治哲学导论课程节选

Mr Neil said "this was a legitimate referendum with a legitimate result".

BBC: Labour: Aberdeen City Council

That's not necessarily a legitimate argument in a capitalist system that's supposed to reward risk taking.

NPR: House to Vote on Alternative Minimum Tax

But is there really no difference between a legitimate NPE and a patent troll?

FORBES: Don't Turn My Company Into A Patent Troll!