If you cannot visit your relatives, friends or acquaintances, you should still keep in touch by calling them or sending them a letter. This will leave them with a deep amicable impression and will keep the relationship alive. Al-Fadhl ibn Marwan, the vizier of the Abbasid Khalifah al-Mu’tasim said, “Inquiring about friends is (like) meeting them.”
In this regard, I would like to quote two poems:
If dear friends missed meeting each other
Then, the best meeting is a letter
I will be grateful every day
To a friend sending greetings while far away
Islamic Etiquette 
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