... by return of post ((英))以回邮,由下一班邮递 send a letter by post 邮寄信件 by post 以邮寄 ...
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send a letter by post
邮寄一封信
以上为机器翻译结果，长、整句建议使用 人工翻译 。
You call it an "empty envelope" to emphasize that it should eventually contain a "letter" (perhaps a business letter) before you can send it by "post".
称其为“空envelope”是为了强调在通过“投递”发出它之前，它最终应该包含一封“信”(也许是商业信)。
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