Your letter has just come to hand .

他 滴酒不沾。刚 收到 你 的 信。

Your letter is to hand .

你 的 来信已 收到。

Your letter has been received . ; Yours to hand .

来示敬悉。

Your letter has come to hand . ; This is to acknowledge the receipt of your letter .

来函敬 悉。