I have been trying and failing to send my PO through quickbooks to a vendor the last couple days. I get the "Quickbooks is unable to send emails due to network connection failure." error message. I have updated windows on my server, I have updated quickbooks, I have deleted my email address from the send forms tab in preferences and re-inputted my email, I have switched from the quickbooks emails and clicked ok - just to go back to the regular email, I verified the file, rebuilt the file and none of this has worked. 

The vendor I was trying to send the PO to has two different names, separated by a semi-colon, in the "To:" box. As a last ditch attempt to do something, I deleted one of the names from the box. It worked. Can someone help me as to why this is happening all of a sudden?