Reference for Gittin 126:17
הוה עובדא ואצרכה רב יצחק בר שמואל בר מרתא גט וחליצה תרתי גט מחיים וחליצה לאחר מיתה
Rab said: A woman cannot appoint an agent to receive her Get from the agent of her husband. R. Haninah, however, said that a woman may appoint an agent to receive her Get from the agent of her husband. What is Rab's reason? — If you like I can say, to avoid showing contempt for the husband, and if you like I can say, because of [the resemblance of the agent to] a courtyard which comes [in to her possession] subsequently.<span class="x" onmousemove="('comment',' After the Get had been placed in it. A Get must either be given into a woman's hand or placed in property belonging to her, (v. infra 77a). If the husband threw the Get into a courtyard not belonging to the wife and it subsequently came into her possession while the Get was still there, the Get is not valid. There is a certain analogy between this and the wife appointing an agent to receive from the husband's agent, so that if the latter were permitted, people might think that the former was also permitted. v. supra p. 95, n. 9, ');"><sup>13</sup></span>