In order to cut down a bit on the daily wave of comment spam, I find it useful to turn on the Discussion option:
"Automatically close comments on articles older than __ days,"
I typically set it it to 365 days. And I find that the majority of comment spam is in fact attached to older posts.
BUT, I have two or three of older blog posts that I WOULD like to leave open for comments. These happen to be "memorial" or "RIP" posts for deceased friends, and even after a few years, people still come by and want to add a comment on these posts. But I can think of a few other older posts provoking ongoing discussion that I'd like to leave open for comments even if they are older than the automatic limit of elapsed time.
Any ideas for a workaround?