A postcard has come here all the way from far away.

People who receive this postcard would think, “It has come here all the way from far away. People who send this postcard would talk to the card in their mind, “Take care! Have a good trip.” 

That is how the postcard works.

In either case, you would cherish this postcard. 

このポスカードが送られてきた人にとっては「はるばるやって来たのだな」と思ってもらえて、

このポストカードを送る人にとっては「いってらっしゃい」と思ってもらえる。

そんなポストカード。

​いずれにしても、ポストカードを愛おしく思える。