That's unsurprising for THAT particular address (as it is a dynamic address my ISP keeps rotating every few days). This is the uneasy balance that I'm striking between really cheap gigabit bandwidth on which our servers sit, vs cost out of my pocket...
But that is NOT the server that sends out the email. At least it shouldn't be. Those should go out via a different system (and out of paranoia I won't post here which one it is).
I just double checked THAT system and it shows "all green" on mxtoolbox
/D