I did scour the net and stackoverflow before posting this question, so forgive me if I overlooked anything already posted.
I admin a large amount of mailing lists through Google Apps. At the moment we do this manually by "please add me to:" or "please remove me from:" emails.
I see no reason though to not do this through a php/mysql form and unsubscribe link.
My problem is that I have no idea how to communicate the mysql requests with google.
Could somebody please point me in the right direction?
Google has something like mysql: http://code.google.com/appengine/docs/java/datastore/
I don't think you are going to be able to hook up to your own mysql from appengine.
You could put a rest api in front of your mysql server though.
Hope this helps