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Thanks for that.  What you are experiencing by the way could be because the server does not have a reverse dns entry.  A lot of servers do not come with those and that could also be affecting your ability to send out email.  Also be sure that your spf records are setup correctly so that they are viewed as credible.  I had a similar issue a while ago, and it had very little to do with my ip and very much to do with a lack of a reverse dns.  Also, you should run a blacklist check on the mail ip to ensure that it is not listed on 1 of the 150 spam lists.  I use mxtoolbox to check that.  Hope that helps.

Hi Jason, I have a site in GWT where it was wrongly setup minus the www and it was showing no links, adding the www version solved the problem. So in that regard it is possible, although it is very odd that it would change from one day to the next. By all means add the non www domain to GWT to see what data you get, but the switch from yesterday and the loss of rankings is worrying and you should definitely dig deeper... any chance there was a server setup change recently that might have thrown a spanner in the works?

Is it still accurate with the latest Google updates and non provided ?

Thank you all for the kind responses,  I will definitely see what I can do.

You are welcome. I hope all goes well.