Hi Rahul, How you want to send bulk email Either manual or Auto with attachment or without. Hi does anyone know any best free PHP script for BULK email sender. [/QUOTE]
http://www.phplist.com/ looks like it might work for you. I personally have never used them (at least, I don't remember using them, but I've worked with so many scripts I might have a while back), but it looks like one of the best free options around.