How to send an email upon webform submission?

Hey,

I am trying to send the web form results to a certain email address.

It keeps popping up the same error every time; "Unable to send e-mail. Contact the site administrator if the problem persists."

I have tried to solve this with the help of various posts regarding and relating to this,still it persists.

I also tried using SMTP,Mail System modules.

Please help me on this matter.

Thanks in advance. :D