Read more about failed deliveries and messages from "MAILER-DAEMON" or "Mail Delivery Subsystem".
Problems with email
Here are some answers to help you
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I've got a "failed delivery message". What does this mean? -
Can I move my BT Email address to another account? Learn how to move your BT email address to another account, including requirements for Standard, Premium, and Basic email types. Step-by-step guidance from BT Help.