最近有家客戶信件發生問題，寄出去的信件只要是公司行號那種都沒問題
對方都收的到但是只要是GOOGLE YAHOO HINET 這種的，都會被退信 不然就是對方收不到信件，之前都正常前幾天才突然變成這樣的 而且是這家客戶所有人都這樣，並不是單一USER的案件，剛好GOOGLE有退信的訊息 麻煩大大們幫小弟看看問題點出在哪邊QQ

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P.S. Si no le responde en dos d=A8=AAas, tal vez no reciba su correo, = favor de mandarme correo otra vez , gracias.