Email problems

Hi

I installed contact form 7 and the emails won’t send. I tried a few other contact forms that I have on other servers which work fine, but will not work on this present webspace. I know this is a C-Panel problem (had a similar problem with indexes not showing and asked them to fix it), but the webhost is blaming me! They are asking what SMTP settings I’m using. I don’t know what to say to them, I have done nothing different to what I did when I installed contact form 7 on other servers. can someone help me with what to say to these people to make them see that they need to sort something out in the C-Panel?

regards
mark