Mail sending problems

For a few days now my users don`t recieve the confirmation e-mail when they attempt to register. I discovered that my contcat mail form also doesn`t work.



I tried to send mail trough web mail and i get this error

Sorry, there was a problem sending your message. Please click your browser's Back button, check your message, and try again.

I can recive mail with webmail but cant send, with outlook I can send and recive. I tried various setting with in whm and in cpanel but with no effect. Does anyone know how to solve this.

 

 

 

 

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