Hagaon Rav Dr Yechiel Yakob Weinberg זצ”ל was the Rebbe, the Dean of Berlin’s Rabbinical Seminary some 90 years ago. He lived in Montreux after the war and was considered one of the biggest Talmidei Chachamim, Torah Scholars of the postwar generation.
He says : Why are we not making a Bracha, a blessing on the beautiful Mitzvah of sending Mishloach Manot? (= gifts of food or drink that are sent to family and friends to symbolise that everyone has enough food for the Purim feast).
And he replies: If we say a Bracha “Asher Kidshanu Vezivanu” – it means that we send the Mischloach Manot just because Hashem “ordered” us (VeZivanu= ordered) to do so. This, in turn, would take away from the warmth and the real friendship meant by this particular Mitzvah.
Of course we do it as part of Mitzvot Purim, but the emphasis is on strengthening friendships.
Warm friendly Purim wishes
Rabbi Chaim Michael Biberfeld