The script times out even though I use set_time_limit() ;

Hi there We`re using a mail script to send out news to 1300 ppl who have subscribed to our newslist... But each time we send mails, the script times out..... and the page cannot be viewed... The weird thing is that "sometimes" everything works ok. I wonder what can be causing this to happen. I have all the email adresses stored in a MySQL table. And "while" i fetch them out, I send a mail to each one of them... I use "set_time_limit(380);" to prevent the time out, but it doesn`t seem to work: Should I put all the email adresses in the "to" field and send one mail. Or have I just set the time limit for the script too low?? Or maybe, there is something else I`m doing wrong... Any suggestions??? -TrOnd-