וַיִּשְׁלַ֨ח סְפָרִ֜ים אֶל־כָּל־הַיְּהוּדִ֗ים אֶל־שֶׁ֨בַע וְעֶשְׂרִ֤ים וּמֵאָה֙ מְדִינָ֔ה מַלְכ֖וּת אֲחַשְׁוֵר֑וֹשׁ דִּבְרֵ֥י שָׁל֖וֹם וֶאֱמֶֽת׃
And he sent letters unto all the Jews, to the hundred twenty and seven provinces of the kingdom of Ahasuerus, with words of peace and truth,
Read halakhic rulings (Jewish law) on Esther 9:30: and classical halakhic sources.