Would Talktalk please listen to their customers and provide a "whitelist" facility where we can specify that emails from certain sources are never rejected by your over enthusiastic filters?
Some of us, see the forum, know you are blocking legitimate emails that quite often come from automated systems and unmonitored addresses so no rejection messages are ever seen nor are the emais themselves kept as they can easily be recreated from back end systems so the fabled "email id" you insist upon for tracing an email simply doesn't exist.
The idea of scanning everything to "protect" your customers is fine in principle but the level of "protection" you impose can result in us being "protected" from legitimate emails the loss of which may well cause financial or other harm to those same customers. The provision of a "whitelist" facility would allow customers to largely avoid this situation if they choose to use it.