Update 10th March : Most clients are back to normal now, but we still have reports of certain clients having some DNS lookups fail. We are manually resolving these. Please open a support ticket with us and let us know the error you are receiving and we will suggest a solution
Update 14:55 : DNS propagation issues with Enom were causing issues earlier worldwide. It has been reported that it is resolved now, but some client might see some issues due to caching. Restart your PC first to see if that resolves it.
9-March-2015 10:00am We are aware of an issue with DNS lookups affecting some domains at the moment. There are intermittent problems at the registrar and will cause some issues with incoming or outgoing emails.
We are working on a solution and should be back to normal shortly.
Apologies for the inconvenience and thanks for the patience.