When it reminds you of all the great domain names you have, names acquired so long ago that you forgot you even had them. On some days I receive about fifteen of these. I report some to SPAMCOP.net , mark all as spam/junk , but in the process, I flip by the names and in some cases think, Damn! that's a good name. I should do some marketing on it. Make a mental note. Even those stupid SPAM emails that reverse the order of your own two word domain name or add a plural s to the name, and offer it for sale to you: might jar your memory about a domain you own. "I own that one? That's a good name!"