Answer
(Fatwa: 906/754/B=1432)
(1) We are asked not to follow the traditional or religious sings of other nations. It is not Islamic way to say “Good Morning” or “Hello”. It is the method of others. Hence, we need not to follow the way of others. If it happens some time, we only can say “Aadab or Hadak-Allah or Assalamu Ala Man Ittabal Huda”.
(2) It is not right as per the Shariah to greet non mahram or shake hands with them. One should avoid it.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband