What do you do when you delete domains?

[RedCherry]

I have let a lot of domains lapse the past year, and it is just dawning on me that this means I have a lot of bad urls out there that have been submitted to link lists. I mean some of these domains I had quite a few sites, and really have no way of knowing what link lists I submitted them too, because I lost a lot of the original files in a hard drive crash.

What do you guys do when you let domains expire? I feel bad, because I know that means some of you probably have dead links, or redirected links from my old submissions.