請問達人供應商給我一封退件郵件.請問這封信退件原因.還有可能需要改善的地方?

因為我也不知道如何跟協力廠商說要改那些設定

狀況是有時候收得到信件.有時漏信

伺服器環境 CentOS Linux 6.4

郵件環境 Postfix version 2.6.6

請幫忙了^^"

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