Do NOT penalize MY communications because YOUR users don't clean up their inboxes. This message:
This is an advisory-only email. Please do not reply to it.
Delivery of email to this address
has been postponed due to a full mailbox.
Is a) incredibly annoying, b) a detriment to ALL communication, c) Un-FREAKIN-NECESSARY. If email storage is a problem, you can solve it by 1) setting email clients to archive aggressively or store messages on user's computers or 2) getting more storage space (HINT: it's bloody cheap!)
Gah. NOT being able to send MY COMPLETED WORK to someone who is waiting on it, because of something that ceased to be a problem in, oh about, 1995, is more frustrating than I have words for. Thanks. That's just what I needed to cap of this glorious day.