Saya sedang coba buat secondary domain, sudah saya tes utk jaringan lokal berhasil utk kirim keluar dan terima email dari lokal. nah gimana caranya supaya email dari luar bisa masuk ke secondaru domain ?

Primary  = pttdp.com
secondary = udin.com

berhubung yang terdaftar di isp hanya domain pttdp.com bagaimana supaya user luar bisa kirim ke udin.com ? saya coba kirim dari gmail ditolak krn binun ga kenal udin.com
apakah si udin.com juga harus didaftarkan ke isp ?

thanks

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