Extending greetings to the grave dwellers
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Question: Are greetings extended to the grave dwellers whilst visitng the graveyard, or in the street whilst walking past the graveyard?

Response: Greetings are extended to the grave dwellers whilst visiting the graveyard. As for passing by the graveyard which is walled in, then greetings are not extended (to the grave dwellers). However, if it is not walled in, then some of the people of knowledge have said: If one passes by a graveyard, then greetings should be extended (to the grave dwellers) so as to attain the reward (for doing so), since (in extending greetings) one is (actually) supplicating for his brothers (and sisters), and as such is doing good for them, and in this is reward and good, inshaa.-Allaah.

Shaykh Ibn 'Uthaymeen
Fataawa li Ahlil-Mayyit - Question 20, Page 23
Liqaa. al-Baab al-Maftooh - Volume 70, Page 231