Is anybody out there?

I belong to a fraternal organization. One of the big benefits is really excellent life insurance rates for members. But much like the drummers in Spinal Tap, every so often my agent explodes. I've had a few. One of the last ones made himself very unwelcome in my house when I failed a blood test because it said I was a smoker. The problem was, I had worked a five-hour bingo the day before. Prior to the indoor smoking ban laws in Illinois, bingo used to equate to old ladies with Marlboros. The blood test indicated I was a heavy smoker. Just so you know, that secondhand smoke thing is no joke. The result was a more expensive new policy. The agent told my wife, "He should sign the contract anyway, it's still a good rate, even for a smoker." That was the end of him.
Even more recently, I got checked out for a change in my policy. Flying colors. But my agent became less and less responsive. Eventually, he stopped answering emails. I floated a phone call. I finally went on their web site and found another agent, who informed me, "Yeah, Floyd has been gone for a few weeks now."
Meantime, my emails were going into a black hole, along with those of several other guys who'd also been trying to reach him.
This is yet another great example of bad deprovisioning policies. When somebody leaves your organization, you have, as I see it, four options with their emails. First, you route them to somebody else who will pick up the pieces. That's a very good approach. It keeps you from losing business.
Second, you kill the account and let those mails bounce. At least the sender knows it's a dead end, but this assumes they'll try to find another body to go to. It can look sloppy. But hey, it's better than thinking you're being ignored.
Third, put the equivalent of a vacation message on the email. "Sorry, this individual is no longer with the firm. Please contact one of these other guys. Here's their contact info." Give the sender multiple options, so it looks less lazy on your part. If you only give them one alternate contact, they'll wonder why you didn't just route them to that person in the first place. Put the onus back on them.
Fourth, leave the account active, and don't do anything with it at all. That's what happened to me. The account becomes a black hole, and results in very frustrated customers.
HOW you handle this situation should be a part of your deprovisioning practices. It should be in your POLICIES. I love that word, policy. In the IAM world, it's not just the way you've decided your org will handle a given situation, it's also hopefully how you've coded or configured your framework, so that it automatically kills, routes, captures. Sure, if you reroute a terminated user's emails, you have to assign a resource to monitor those mails. And you should. It's preferable to an interruption of service.
Your organization is only as strong as the weakest link. Keep all your links strong, even when in fact they're not there anymore.