Here’s an example. At work I am probably one of the a VERY small number of Graduate Assistants that uses Outlook. Even though Toledo provides Exchange email to every faculty member and student, most people still rely on hotmail, aol, etc.. for their personal mail (heck, my exchange mailbox there works but it forwards to my own exchange server…), so using OWA’s address book is not always best to get valid email addresses - the person may only check that mailbox once a month or so.

So we heavily rely on “Reply to All” to make sure people actually get email at boxes they check. This requires us to not use BCC to make sure that certain groups / teams are able to communicate. It all works fine until someone lets an internal email slip out to the internet - then spamgates open wide.

The only real solution to this would be extensive implementation of grouplists or aliases pointing to multiple addresses (Similar to what we do with the news@ alias at PPCT). However again this would require a diligent admin to keep the address aliases current.

So my point is this: BCC is great when you’re sending out to large amounts of people and those people never need to, or should, communicate with each other. However, when those people need to communicate with each other and need to use “Reply to All” for it’s legitimate uses (e.g. not sending out notices that your grand-daughter is selling cookies), BCC simply isn’t an option.