mail sent successfully in the local but not in server

I am working on ecommerce website in nopcommerce. I wanted to send the mail ,when the user has already registered before and trying to register again with the same email id.Mail contains the body content as "the username of this user is some username".When i wrote the code and executed it, its working fine on local.But when i run it in the server (after creating a new website in the IIS server),the mail is not sent.Another thing is that the page i created ,which will show up as"mail is successfully sent" shows up in the local.But it doesnot showup in the server even though the url is the same.Can anyone suggest me the solution.

can you please share the details of settings you have done for the Mail Settings ?
I mean smtp and other server details ?