One of the biggest differences between Aweber and companies that are offering a php mailing script, is that Aweber/Constant Contact/ect have whitelist agreements with most major ISP's so that their emails go through. These agreements are said to cost tens of thousands of dollars.

Now that isn't to say that php mailing scripts/services are not valuable, but you need to constantly ensure that the ip ranges are not on any rbl lists and even then its hit and miss whether emails will go through. That's why most people who purchase similar systems are setup for their sole purpose, because its really easy for one customer out of 100 to mess things up for you.

Anyway, one solution I found after doing a quick search is

Yep, I second what OnlineMarketingSys said, it's not the actual subscribers managing scripts that matters it's the deliver-ability of the e-mails sent that brings the money to companies like Aweber.

I understand the whole thing about aweber. its just my customer wants his own for his own system for his own personal clients.

Yes it is very true i have tried a few autoresponders and most have sent my emails to junk,aweber has a 98.8 % success in reaching your inbox.

Try Auto Response Plus
they will set it up for you free.
I use that (about $195.00) as well as Aweber.

There is no Affiliate Link here!
Just a recommendation.

You could consider WordPress for the website:

There are WordPress plugins like WordPress › AJAX Login WordPress Plugins
that might be able to be used for registration/signing up to a newsletter.

There are other WordPress plugins (WordPress › WordPress Plugins) that you might use to send emails to registered users, and to allow registered users to unsubscribe themselves from emails.

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