EDIT: I figured it out.
I am using phpBB3 3.0.10
SMTP: tls: //email-smtp.us-east-1.amazonaws.com (you should add that tls: // prefix!)
Port: 465
Authentication Method for SMTP: PLAIN
SMTP username / password: Use the one you configured in Amazon IAM.
For example, my user name is AKIAJKVKV2TENFEUP6WA and the password is even more complicated.
Based on initial findings, Amazon SMS is pretty fast. It turns out in a few seconds.
-Josh
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