Maybe the parcel was too large to come by letter post.

也许是包裹太大了，没法随信件邮班同来。

youdao

You could do it by e-mail today, but try asking Royal Mail's letter post to do it...

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If so, why was the letter post-dated?

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Miss Swapna hurts and committed Suicide when her dead body was in her home, she got job conformation letter through post. if she waits for another half an hour she had a bright future.. but a valuable Human life closed because of false decision.

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