Email just stopped?? LIVE SITE

Yes I running newest verion of zen-cart..

To day my client asked why the zen-cart logo was on his email he was sending out to his customers.. (i figured out that) but this AM i send me a email via the TOOLS - send email.. and got it in like 2 min..

Then I was fixing the email logo up now.. and it won't send me an email out.. i have tested it to 2 differn't email accounts..

Plus it doesn't send out my Orders to the customers or my ADMIN?? this isnt' good on a live site

I'm just using the DEFAULT PHP emil settings. havn't changed them from day 1 ..

Can't figure out why it just stopped working

:cry:

Ok this is strange.. I"m getting my email if i place an order.. i get the order coming in to my [email protected] account.. but i have the process cc inhouse on and the rest of the CC string goes to another EXTERNAL email account.. not the DOMAIN's it doens't go..

now this is STRANGE..

ANY IDEA Live site is down on this..