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CiviMail throws the error Mailing_send_test : STARTTLS failed when doing a test email. Sending results in bounces. I have a handful of CiviCRM installations running on the same server and only 4.7 installs seem affected.

Version 4.6.9 no error. Version 4.7.3+ error as described.

Does anyone know what would have caused this?

(I did recently add mysqli per the recent blog post, and I went from PHP 5.5.38 to 5.6.24 in the process. But perhaps that's unrelated.)

Edit: I use CiviSMTP.

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This sounds like it's the same problem described here.

While the solutions there suggest hacks to the code, most likely you're either a) connecting to a mail server that has a self-signed certificate, or b) your CiviCRM is installed on a server with an outdated list of CAs. Fixing the root problem is preferable. Let's Encrypt issues free SSL certificates in case your problem is the former one.

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  • Thanks for the tips. I tried the fix in the thread you referenced with no luck. So I reverted those changes then took the coward's way out and rolled PHP back to 5.5.38 which resolved the problem. I'll explore the rest of your advice in the meantime.
    – Eric H
    Aug 17, 2016 at 23:20
  • @EricH Do you have root access on the server your CiviCRM is hosted on? If not, talk to your webhost! If so - are you running an outdated version of your OS? Also, if you're running FreeBSD, I think the CAs they ship with are out of date.
    – Jon G - Megaphone Tech
    Aug 18, 2016 at 19:08
  • I have root access. It's running CentOS 6.8.
    – Eric H
    Aug 19, 2016 at 20:52

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