I'm looking into how I'd get something like this contracted out. A list of clients getting sent a email. The email contains a list of options. Client clicks on one of the options in the email and then an email is generated on a server with the clients option marked. Would PHP be the way to do this (I've no experience in this)? A database with all users, with unique IDs that are are embedding into the links so when the clients hit the link it brings them to a browser page saying "thanks etc".
If this system was practical, how long would it take to set up for e.g. 700 users?