My WordPress can’t send emails

Hi!

Sorry, my English is horrible but I’ll try to introduce my problem the best I can.

I have a blog powered by WordPress hosted in a paid server of AwardSpace. It’s suppose that my WordPress is able to send mails since I am a paid user (before, SMTP were disabled), but there is a problem:

AwardSpace discards mails with differences between FROM field and the name of the mail account. To make it short, the ‘FROM’ field must match with the mail account.

What must I change in order to make it possible?

Would I have to change something in the wp-mail.php archive?

What can I do? 🙁

Thanks.