In Dada Mail [0], there's quite a few steps to figuring out if the email address submitted for a mailing list subscription is valid, but most of it can really b

In Dada Mail [0], there's quite a few steps to figuring out if the email address submitted for a mailing list subscription is valid, but most of it can really be organized under sanitizing the data you receive, which you should be doing anyways. Yes, we do validation for form of an address client side (which helps with hitting the server side so much), but we'll do it again server side. We also look at stats on how many times an address was submitted before, as well as per ip address over time across all fuctions of the app (as well as specifically for subscribing). Oh, and even if it's valid, and "real", sometimes we don't want to work with it either, ie: it shows up on something like StopFormSpam. It's actually a ton of work and much to orchestrate. [0] http://dadamailproject.com http://dadamailproject.com