A Demon Internet data centre outage on Wednesday continues to send problems rippling through the rest of the company's network.
Email and e-commerce services were knocked out, and some leased line users lost their connection. Customer service phone lines were providing a restricted service.
A spokeswoman for Demon said that the service provider experienced only "a brief outage" and that the majority of the problems had been resolved.
"It only affected some customers, who did not receive email for part of yesterday," she said. "No mail was lost, and all messages were stored and passed through as soon as was possible."
However, Demon's status page this morning indicates that the email service is still affected.
Users have confirmed that Pop3 email access remains down, with some still waiting to receive mail from before yesterday morning.
Demon confirmed that the problem is a hangover from yesterday's outage and that engineers are still investigating.
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NatWest outage comes a day after Barclays' IT systems shut out customers and staff