I can't send emails & test emails since yesterday (Oct 10) after 3:10pm. I don't know whether it matters to the API which I started using yesterday. Can you help me to test out?
Thank you for bringing this to our attention! I took a quick look at your account, and I believe the issue may be related to your recent changes, as you suspected. This is something that takes a bit too much personal information for us to troubleshoot on a public forum, but if you call our account review team, they should be able to help get this cleared up. You can reach them directly at the numbers listed here.