I've just got a new job as a web developer (yey!) and I'm going to have to produce a newsletter system as my first assignment (php/mysql). But I was wondering whether it would be better to use a prebuilt package. I've looked at Inspire's SendStudio and although that is very expensive, I think there must be cheaper alternatives. What would you use and why? Or would you rather code the whole thing yourself? Given that it is a fairly standard script I think it would be easier to use someone else's complete package.

Daniel