I haven't been able to figure out what is causing this. I thought it was intermittent, but it seems to be more prevalent as it happens on almost all send_email calls eventually.
Easiest test so far has been to move cards to the Scheduled list, but I've seen it happen on new submission confirmations too.
Need to print out the response's text and see what SendGrid is telling us about it.
I haven't been able to figure out what is causing this. I thought it was intermittent, but it seems to be more prevalent as it happens on almost all send_email calls eventually.
Easiest test so far has been to move cards to the Scheduled list, but I've seen it happen on new submission confirmations too.
Need to print out the response's text and see what SendGrid is telling us about it.