It is narrated from Anas bin Malik (may Allah be pleased with him) that it was said: O Messenger of Allah (peace and blessings be upon him)! When we meet, should we bow to one another? He (peace and blessings be upon him) said: "No." Then he asked: Should we embrace one another? He (peace and blessings be upon him) said: "No." Then he asked: Should we shake hands? He (peace and blessings be upon him) said: "Yes."
Only Hanzalah al-Sadusi narrated this, and he had become confused (in his memory); Yahya al-Qattan abandoned him because of his confusion. And Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13573