Publish via Email not working

Signed up for 14-day Pro trial yesterday. So far, I haven’t been able to successfully publish to my new blog via email. From Gmail, I’ve sent several emails to the ‘secret’ email address that came with my write.as blog. Nothing appears to happen and nothing shows up on the blog.

Still no luck on this. However, my email-posts finally bounced back to me today. Here’s a screenshot from the Mail Delivery Subsystem message. Does this help identify the issue?