PHP and email

Hi I have a dedicated server in the states. I need to send about 8000 emails (once off). There pretty small +- 5KB. so I want to write a php script and run it from the command line in the background. I was thinking of sending 50 emails then waiting 90 seconds then sending again. Or the same script gets run by cron every 90 seconds and just sends 50 emails. What do you recommend? thanks clive -- Angelo Zanetti Z Logic www.zlogic.co.za [c] +27 72 441 3355 [t] +27 21 469 1052