I would prefer to use something open source.
I have a client site and he wants people to be able to sign up on his website to receive emails. Pretty typical, BUT he wants to collect their ZIP codes too. So 3 fields, name, email, & zip.
I have to form built into the header of his wordpress site. I just need a script that would allow him to collect all 3 fields, manage the email addresses and send out updates and such using HTML and the ability for people to unsibscribe.
I know there are some good open-source, but I'm in a time-crunch and can't research them all. System is LAMP.
So I need the following: