Apple Seeds Second OS X 10.11.3 El Capitan Beta to Developers and Public Beta Testers
Apple today seeded the second beta of an upcoming OS X 10.11.3 El Capitan update to developers and public beta testers for testing purposes, three weeks after seeding the first OS X 10.11.3 beta and a month after releasing OS X 10.11.2.
The second OS X 10.11.3 beta, build 15D13b, can be downloaded through the Apple Developer Center or via the Software Update Mechanism in the Mac App Store for those who installed the first beta.

The first beta of OS X 10.11.3 did not include any noticeable outward-facing changes, suggesting the update will focus on security enhancements, performance improvements, and bug fixes to address issues that have been discovered since the release of OS X 10.11.2. Prior OS X El Capitan updates have also focused mainly on under-the-hood improvements.
We'll update this post with any changes that are discovered in the beta.
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Top Rated Comments
If your mails are so valuable then I strongly suggest you not to use betas....
I miss Yosemite.
I'm afraid that is going to happen. At this rate I'm fairly certain it will take at least 10.11.4 or .5 before Apple fixes Time Machine failure to restore files that I reported during beta testing... :mad:
One can hope but I'm fairly certain hell will freeze over before that happens... :(
I had a similar situation and I didn't lost any emails because I tested 10.11 on external drive and stopped using it moment I noticed the Mail problem.
I'm going to stay in Mavericks for the foreseeable future because 10.10 and 10.11 have no benefits for me and both contain too many bugs and baffling design decisions.
It seems certain Apple no longer cares about OS X. :mad: