I'm running Zimbra mail server on a Linux box. Thought I'd give Elementary a whirl to see if it's something my family members could use. When I ran Mail and gave it my account settings, I was prompted to trust the server (which has a self-signed certificate). After I did so, I got the message

Unable to store server trust exception Couldn't find a place to store the pinned certificate

Not quite sure how to proceed here. Seems to me there are plenty of places to store a certificate :-)


If you are using a Gmail account, you gotta active an option that makes you free to login in any external app from Gmail.

Just go to GMAIL Main page > Settings > Fowarding and POP/IMAP

Once you are here in Fowarding and POP/IMAP

Enable IMAP

Hope that works your u, it work in my case.

  • Eh? I'm running my own mail server with my own domain - nothing to do with Gmail. Also, I'm trying the email application built into Elementary (a Linux distro) and trying to connect to my own mail server. – David Sep 10 at 17:53

You said in a comment it was on your own domain. Rather than using a self signed certificate, I'd encourage you to use Let's Encrypt I'm using it for my own nextcloud, as well as a home developed webapp. They've got great tools and docs to help you set it up, and even auto refresh it at 90 day intervals.

What they give you is a FREE (as in beer, at least) signed ssl cert. That you may even use commercially.

  • Sure --- I have LetsEncrypt on other servers. But the issue here is that mail clients on various other OSs that I use have no problem accessing my mail server (Mac OSX, Windows, iOS, Thunderbird on Linux) and the issue is only happening with the mail client that comes with Elementary. – David Oct 10 at 17:35
  • In that case I think you need to file a bug report on GitHub github.com/elementary/mail I do think it should give you a warning, but not prevent usage. – user3801839 Oct 10 at 17:48

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