The document states that female non-governmental organizations are prohibited from working until further notice, as some of them did not follow the Taliban's Islamic dress code.
Economy Ministry spokesman Abdulrahman Habib told Reuters that the letter concerned organizations that are part of the Agency for the Coordination of Humanitarian Assistance Programs in Afghanistan (ACBAR).
This body includes more than 180 local and international non-governmental organizations.
The UN is not a member of ACBAR, but the organization often contracts with NGOs in Afghanistan to carry out humanitarian activities.
Humanitarian workers note that the organization's employees play a key role in ensuring access to aid for women.
After coming to power, the Taliban promised to respect women's rights, but soon began to introduce restrictions.
In September 2021, they changed the rules for universities: men and women are required to study separately and come to classes in accordance with a strict dress code, which involves full observance of the traditions of Islam in the understanding of the Taliban.
Islamists eliminated the Ministry of Women's Affairs, which had existed for 20 years, limited access to school education for girls, banned women from playing sports, and forced TV presenters to wear the hijab.
On December 20, the Taliban government ordered the suspension of access to universities for female students.
Foreign governments, including the United States, have said the Taliban need to change their policies on women's education before countries can consider formally recognizing the Taliban administration.