For personal email, I have my own domain and hosting account. I can easily change ISP's or hosts and no one will notice. Same for the company. With the dedicated host, it's easy to have 'his/hers/kids@', 'info@', etc. mailboxes.

I've always been tempted to create a 'spam@' for one-off contacts while I'm researching something. This will avoid my real address from being passed around and give a hint that I really don't want to hear from them again.

For the company host I have a filter that will block messages from 'Dr. Phil' and 'Viagra', 'V1agra', etc. The server returns an error message to the sender indicating that the message cannot be delivered. I log the blocked messages, but they don't appear in my inbox. Evidently, the spammers manage their lists because the level of blocked spam has decreased dramatically over the years -- except for "Military Grade Flashlights".