CiviMail reports all successful deliveries none actually sent

I'm operating CiviCRM in multisite for a few WordPress instances (multisite for CiviCRM, not WP multisite). After upgrading from 4.6.10 to 4.6.11 and checking all the config settings on each site and confirming Outbound Email (SMTP/Sendmail) can send a test email, I thought I was in good shape.

I setup a small mailing for an upcoming event on one of the domains and sent it out, or at least I thought. Nothing actually got sent out. I checked the cron and everything looked good. I tried again on another domain for another bigger event and the same results:

Intended Recipients 796 ReportAdvanced Search
Successful Deliveries 796 (100.00%) ReportAdvanced Search
Tracked Opens 0 ReportAdvanced Search
Click-throughs 0 ReportAdvanced Search
Forwards 0 ReportAdvanced Search
Replies 0 ReportAdvanced Search
Bounces 0 (0.00%) ReportAdvanced Search
Unsubscribe Requests 0 (0.00%) ReportAdvanced Search
Opt-out Requests 0 (0.00%) ReportAdvanced Search
Scheduled Date January 12th, 2016 1:14 PM
Status Complete
Start Date January 12th, 2016 1:30 PM
End Date January 12th, 2016 3:30 PM

I've been messing with this and looking to see if anybody else is having this issue but I haven't matched a similar problem. I'm poking around the database and trying to see what might have changed that is causing CiviMail to "simulate" successful mailings rather than reporting a problem (or just working).