I selected all Members in search (9236), composed an email and left it at Default to send 1 at a time.

It counted up to 355 Batches and Admin Log says 'SEND_EMAILS' Total: 8870 -> onebyone
So.. a Batch is 25?

Anyway, does the Admin Log entry confirm the emails were definitely sent?
It's been 9 hours and I haven't received my own email or seen a single one come back. I've gotten thousands of undeliverables in the past. Could my Host (Inmotion Hosting) be holding the emails to be sent later?