Во! я подправил сортировку
Array
(
[0] => ga10@gmail.com
[1] => ya10@yandex.ru
[2] => ga11@gmail.com
[3] => ya11@yandex.ru
[4] => ga12@gmail.com
[5] => ya12@yandex.ru
[6] => li10@list.ru
[7] => ga13@gmail.com
[8] => ya13@yandex.ru
[9] => ga14@gmail.com
[10] => ma10@mail.ru
[11] => ya14@yandex.ru
[12] => ga15@gmail.com
[13] => ya15@yandex.ru
[14] => li11@list.ru
[15] => ga16@gmail.com
[16] => ya16@yandex.ru
[17] => ga17@gmail.com
[18] => ya17@yandex.ru
[19] => ga18@gmail.com
[20] => ya18@yandex.ru
[21] => ga19@gmail.com
[22] => ma11@mail.ru
[23] => li12@list.ru
[24] => ya19@yandex.ru
[25] => ga20@gmail.com
[26] => ya20@yandex.ru
[27] => ga21@gmail.com
[28] => ya21@yandex.ru
[29] => ga22@gmail.com
[30] => ya22@yandex.ru
[31] => li13@list.ru
[32] => ga23@gmail.com
[33] => ya23@yandex.ru
[34] => ga24@gmail.com
[35] => ma12@mail.ru
[36] => ya24@yandex.ru
[37] => ga25@gmail.com
[38] => ya25@yandex.ru
[39] => li14@list.ru
[40] => ga26@gmail.com
[41] => ya26@yandex.ru
[42] => ga27@gmail.com
[43] => ya27@yandex.ru
[44] => ga28@gmail.com
[45] => ya28@yandex.ru
[46] => ga29@gmail.com
[47] => ma13@mail.ru
[48] => li15@list.ru
[49] => ya29@yandex.ru
[50] => ga30@gmail.com
[51] => ya30@yandex.ru
[52] => ga31@gmail.com
[53] => ya31@yandex.ru
[54] => ga32@gmail.com
[55] => ya32@yandex.ru
[56] => li16@list.ru
[57] => ga33@gmail.com
[58] => ya33@yandex.ru
[59] => ga34@gmail.com
[60] => ma14@mail.ru
[61] => ya34@yandex.ru
[62] => ga35@gmail.com
[63] => ya35@yandex.ru
[64] => li17@list.ru
[65] => ga36@gmail.com
[66] => ya36@yandex.ru
[67] => ga37@gmail.com
[68] => ya37@yandex.ru
[69] => ga38@gmail.com
[70] => ya38@yandex.ru
[71] => ga39@gmail.com
[72] => ya39@yandex.ru
)