Tried to sign up to a newsletter but couldn't. Contacted the site admin who said AWeber were blocking it. Got in contact with them and they said they weren't blocking it, and asked for screenshots. Sent them the screenshots and they then said they had unblocked it. I asked why it was blocked because I own the domain, and as far as I am aware, I have been the only owner. They refused to elaborate further. So I have no idea why they decided to block me, if they're going to do so again in future, if they've just unblocked a single address or the entire domain, etc. Just seems ridicculous to have so much secrecy around signing up to a newslettter.