My inbox emails are not opening correctly. When I open an unread email, it opens as if has come from me in a Send format with a message at the bottom, saying "A unique identity matching the From address was not found. The message will be sent using the using the current From field and settings using the identity Lucy Tilney <lucytilney@talktalk.net>". I've attached a screenshot I sent an email earlier and requested a copy to be sent to me. Since then, all my new emails are opening as I have sent it to myself. Could that be the cause? It's extremely inconvenient and means that I can't open any links included in the emails or reply to them. Can someone help me urgently with this? Thank you.