Shaykh Abdul-Muhsin Al-Abbaad was asked:
“What does a person do if a strange [i.e. non-mahram] woman extends her hand to be shaken?
”He does not extend his hand and holds it back. He says me shaking [the hand] of someone like you is not allowed”. End translation. [Sharh Sunan Ibn Majah no. 264]
Faisal Ibn Abdul Qaadir Ibn Hassan