بسم الله الرحمن الرحيم
(Fatwa: 294/241/SN=03/1437)
According the Shariah, musafaha is practiced at the time of meeting. Doing musafaha after salahs is not proved from the Holy Prophet Muhammad, may peace and blessing of God be upon him, as well as from the sahabah and imams, so it is wajib to avoid it. The member of the Managing Committee of the mosque is right, and it was also explicated by the scholars of fiqh that musafaha after salah is bida’h and makrooh.
و موضع المصافحة فى الشرع انما هو عند لقاء المسلم لأخيه لا فى ادبار الصلوات فحيث وضعها الشرع يضعها فتنهى عن ذلك ويزجر لما أتى به من خلافه السنة الخ (رد المحتار على الدر المعتار 9/548، كتاب حظر والأباحة ، ط: زكريا وفتاوى محموديه 3/140 ، ط: ڈابھیل احسن الفتاوی 1/354)
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband