Question:
Yeshiva students and Avrechim that eats at the yeshiva from donations money, must the “guest blessing” be added to the food blessing?
Answer:
Even that it is don’t must to say since the diners do not dine with them, it is better to add the guest blessing and honor the donors who donated their meal, and say in the blessing of the Harachaman:
“הרחמן הוא יברך את בעלי הסעודה הזו, הם וכל אשר להם”
Sources