Btinternet rejects Forum emails!

The Forum relies on sending emails to our supporters. Unfortunately, those supporters with btinternet email are not always receiving them as BT keeps rejecting our emails as Spam. We have tried sending them to small groups of 5 people and when they were rejected, individually. Unfortunately, even those were rejected. If you can add the Forum email as a 'safe sender' this should work or failing that, please check on this website for the latest information.