email problems?

[bebi714]

when trying to register... this is the error msg i received:

 

Warning: mail(): SMTP server response: 501 5.5.4 Invalid Address in D:\hshome\datviet\blah.com\includes\classes\email.php on line 522

 

Warning: Cannot modify header information - headers already sent by (output started at D:\hshome\datviet\blah.com\includes\classes\email.php:580) in D:\hshome\datviet\blah.com\includes\functions\general.php on line 33

 

 

how to fix this problem?

 

thnks