Each time I try to send an email from either Talk Talk webmail or Mozilla Thunderbird, it is returned to me with Delivery Status Notification Failure;
The following message to ... was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-"SC-004 (SNT004-MC1F13) Unfortunately, messages from 62.24.202.73 weren't sent. We recommend that you contact your Internet service provider. The problem is that too many unwanted messages have been sent from the following IP address above.
But the email appears in my Sent file. Can anyone help pse?