it is our email service provider that provides SMTP relay... they upgraded their servers and something went very wrong and everything got caught in a loop. I had to pull the plug on ETO, EDA, 3dcadforums, mcad and all 40 of our wordpress sites. My webmaster email account is unusable right now with over 100k loops. Every event on ALL the sites get sent in an email.
Anyhow none of the sites are sending out emails so no notifications or confirmation emails etc. It should have stopped once I pulled the plug on them. Now trying to setup a quickly hold over gmail account until I can get our send grid account setup