I have Subscribe2 and WPMQ (WordPress Mail Queue, which costs money) to handle email subscriptions to my blog. Sending is NOT a problem and I've throttled emails down to a manageable level so as not to interfere with other things.
However, I get tons of failure messages, many of them repeat after every post is published. What I want instead is for those emails to be taken out of the list - "unverified" or deleted, if the user doesn't exist.
How can this be done?
Note: post emails are being sent from the post author with Reply-To as the post author, but Return-path set to the hosting account user. This way, none of the post authors get any failure notices and they all go to the hosting account user (which is different from the WP admin email).