With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: Although this email and any attachments are believed to be free of any virus or other defect that might affect any computer system into which it is received and opened , it is the responsibility of the recipient to ensure that it is virus free and no responsibility is accepted by Century Development or any of its affiliates for any loss or damage arising in any way from its use .
text_B: The receiving did not happen
entailed.