18. The recipient must know that someone sent him mishloach manos in order to increase friendship [Reason 2]. If he did not get it, the sender was not yotzei (תשוה"נ פורים עמ' קס"ח ). However, his wife’s or children’s knowledge suffices since the sender presumably had them in mind as well.
19. Leaving it by the door. If the recipient is not home but will return on Purim day and see the mishloach manos, the sender is yotzei. If, however, he is out of town or, for some reason, will not find out about it on Purim, the sender is not yotzei (ערוה"ש סי' תרצ"ה סט"ז ).
20. Therefore, if one knows he will not get home until after Purim, he should ask a neighbor to bring his mishloach manos in and inform him by phone who sent them to him in order to help the senders fulfill their mitzvoh.
