Error sending reports by email

The system show me the following text after i try to send report clicking in “send report now”

An error occured while sending ‘PDF Email Report -’ to Error was ‘Unable to send mail. mail() [function.mail]: Bad parameters to mail() function, mail not sent.’

anybody can help me please?

Did you try sending to a different email address? Can you pull a simplified report-let (just one) and try emailing to see its related to any particular report?

I have the same issue for any format that I tried to send. Any resolution to this or helpful info?