Question

how postmaster and coachman ali realise the mistake

Answer 1

Heyy..
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The post master realised hia mistake when his daughter was ill and he had not got any letter from her about her ...
hope it helps

Answer 2

Ali:

When his only daughter Miriam left him, he felt the pain of grief and separation . He field the pain of the birds which he had hunted . So he gave up hunting

Postmaster :

When postmaster's daughter was ill in another town, he realised the value of a letter. He waited anxiously for her letter and understood Ali's pain. He regretted humiliating Ali as a mad man as he now underwent the same pain .