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Delay/disruption tolerant networks (DTNs) are known for frequent and long duration partitions and end-to-end connectivity may be absent between the source and the destination. Anycast service is used for applications such as information exchange in hazards/crisis situation, recourse discovery, etc in Delay Tolerant Networks. For a specific type of DTN, where the mobile nodes are sparsely distributed, communicating via low radio range experience frequent and long duration partition and end-to-end path may not be present at the time of message generation. We have proposed a Receiver Based Forwarding (RBF) scheme for anycasting in DTN, which considers the path length as well as the number of receivers in forwarding the anycast bundle to the next hop Group size plays an important role in DTN anycasting, the group size varies in different scenarios. In this paper we have studied the effect of group size on our proposed Anycasting protocol by varying the group size from 3 to 15. Our simulation results have shown that the RBF performs better than the normal forwarding (NF) in term of data delivery ratio, average end-to-end delay and overall data efficiency because the probability of available receivers increases.