Max:

I'm sorry to ressurect this issue, but after the shenanigins of last week, I see we now have a new outbreak of spam from people posting as guest.

Earlier this week, I emailed my Member of Parliament about something, using a site writetothem. To block spam, when you post, an automatically generated email is sent, containing a confirmation code, and the post is only completed if this is returned. There must be a time limit, though I don't know how long.

This stops machine generated spam, and I feel that while Guests are far more often valuable than not, it's not a lot to ask that they should either sign up as members, or confirm their post by returning the email.