auto sending bulk emails in php

[erikkangaroo]

the other day i got an order from a customer and he asked me to write a script that can email website articles when he submits them fist thing he asked was sending emails to all users in a way that doesnt make any problem for his server cause he has lots of users ok now for making this script i should plan for writing an email script that can send article to all users after submiting a news by the author.

• this script should quee emails not to make the server down
• and it should works on background and autumatically

nice example of this script can be phpbb3 group mail section i googled to find something usefull for this script , any php class that can help what's your suggestion and how would you write if this order came to you ?