Blackberry Email message "General Failure"


New Email
I have encountered a message error today on email I am sending to contacts. There is a red X with the message "General Failure". This is the first day I've had this problem and it seems sporatic. I can send to the address sometimes, and at others I get the error message. What can I do? I've re-synchronized the email addresses.

Also, I do not receive all emails sent to me on my Blackberry. I find them in my inbox on the laptop only. Help!!!