If I set up an email address using google accounts and it's using the same domain as the blog, does that count as an on-domain email? I'm struggling to see any issues with my setup that would explain why my emails are not getting out. I've worked with the host (Justhost) and they find nothing in the logs to indicate any issues using the "from" email address. Their hourly limit is 750, not broken down any further - just a total of 750 in a single hour, and they can even be sent all at once.
I'm stumped (and frustrated).