21. Some say that the main thing is that the giver gives mishloach manos on Purim day, even if the recipient only gets it later [Reason 2]; others say that the main thing is that the recipient receives it on Purim day, even if the giver sent it earlier [Reason 1]. Therefore, one should ideally fulfill both by making sure to give at least one mishloach manos on Purim day that will also be received on Purim day, not at night (רמ"א ס"ד ).
22. Also, one who keeps the 14th should give to someone who keeps the 14th, while one who keeps the 15th should give to someone who keeps the 15th so that both the giver and recipient are chayav in the mitzvos of Purim on that day.
23. Companies that distribute mishloach manos. Companies which receive orders for mishloach manos and deliver throughout the city are often unable to deliver everything on Purim day due to the heavy Purim traffic in chareidi neighborhoods, and they often bring them the day before or at night. Unless it was expressly stipulated that they would be delivered on Purim day, this is not misleading the client since it is assumed that they can also deliver beforehand.
