plz help with this error code

[paul01609]

just installed template on my server and im getting this error after order has been placed,but when i click refresh all seems ok and the test order came threw fine.if any one could help me out plz many thanks

 

Warning: mail() [function.mail]: Could not execute mail delivery program '/usr/sbin/sendmail -t -i -f *****@******.co.uk' in /usr/home/****/domains/*******.co.uk/public_html/includes/classes/email.php on line 502

 

Warning: Cannot modify header information - headers already sent by (output started at /usr/home/*****/domains/*******.co.uk/public_html/includes/classes/email.php:502) in /usr/home/*****/domains/******.co.uk/public_html/includes/functions/general.php on line 29

[paul01609]

some one plz

[paul01609]

any one?

[paul01609]

just installed oscommerce from here and im getting the same error is this a hosting problem?