Thank you, Daniel. It’s useful to have confirmation that it isn’t just an internal IOP problem.
The 200 was (hopefully!) a one-off “splurge” when our publishing team were changing their internet service provider. I had something similar, which was never repeated.
The publishing team are looking into these repeated emails, but it maybe that we won’t be able to fix it before our new version of TalkPhysics goes live. That is due by the end of March.