If some auto-forwarded mail messages do not arrive in your TalkTalk Mail Inbox it's usually because the sender requires its messages to be fully authenticated but the intermediate forwarding service does not provide that authentication.
Messages may arrive in your Inbox if a soft fail of authentication is allowed or may be diverted to your Spam folder or may simply be rejected especially if the DMARC policy set by the sender is to reject unauthenticated mail rather than quarantine or take no action.
What is the originating email domain for auto-forwarded messages not received? Domain is the part of the email address after the @ symbol for the sending email address?
