[otrs] Problems on email notification

Hi Dears, I do not figure out something related to e-mail notification of OTRS. I want to receive mail when customers send a new ticket. But I don't know how can I do this :(. I've added some email addresses to corresponding queue using Email addresses on admin area. Is that right operation? If so what should I do next? Even though I've read admin documentation for many time, I do not understand enough :(. I did not receive any mail from OTRS. Can anyone help me? -- Altangerel Ganbold