I just contacted QB through the Help option within the software and received a call back within 2 minutes.  The tech instructed me to change to QuickBooks Email from Web Mail within Send Forms My Preferences.  I then was able to send the paystubs I was trying to send all day.  The only drawback is that these will not show up as sent emails in your gmail account and there is no way except checking with the recipient because all you receive is the pop up that says they were sent.