I used to lurk before posting on sites for a while. New writers can be bashful. But if you're able to see them not logging on, I'd think a year of not logging on is uninterested enough. Can they still re-join?
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Whatever policy you've had for spammers, it's working. That sure has decreased here since a year ago.
The back end of the forum has reports, so never logged in is a real thing I can see. It also shows how many days it's been since someone last logged in. So when someone hasn't logged in for 2000 days, and never posted anything, I think it's safe to say they never will.
Yes, people can register again.
It's not so much a policy, as an effective strategy. I redid the base privileges, so until you get a post approved, they don't show up to anyone but me. And until you get that first one approved, you can't send PM's or do anything but read. So none of it gets seen by anyone but me.
We're averaging several dozen spam posts a day at the moment. Varies a bit. Some days I get 30 or 40 attempts to register, but only 6 or so actually do.
There could be genuine people who don't get their activation emails because of gmail and hotmail, but looking at the names, I doubt it's many. And they can email me using the help address on the forum to get activated if they need to.