postfix 的錯誤訊息 queue file write error - BBS

OS: freebsd
mail server: postfix-2.3.3,1

error message:
send-mail: warning: premature end-of-input on /usr/local/sbin/postdrop -r while reading input attribute name
send-mail: fatal: tonytsai(1001): queue file write error

請問這錯誤訊息該如何解
謝謝

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