I'm writing a wrapper in perl to implement confirmed-unsubscribes (initiated via a webform, unless your subscribers can stick to the required email format).

Is there anything I should know?

-- Satya. <URL:http://satya.virtualave.net/> US-bound grad students! For pre-apps, see <URL:http://quickapps.cjb.net/> Computer lie #1: you'll never use all that disk space.