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Removing Expiring SSL (TLS) cert caused inability to receive mail in Thunderbird Mail

Posted on 2016-10-04
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Last Modified: 2016-10-05
Hello!

I recently switched my SSL (TLS) certificate from a regular one to Let's Encrypt. I decided to get rid of my old expiring cert files, but I physically removed them, I've started to have strange issues with Thunderbird Mail. Normally after I open the application, I get a login box. And after the old cert files removal, I stopped getting the login and also stopped receiving mail. Sending was fine. Also the SMTP server was working, since in a web mail access everything worked as usual. Only after I put back files that belonged to the old cert, Thunderbird Mail started to work as usual. I don't understand the connection between my old cert files that I was using for HTTPS and Apache and Thunderbird Mail, its login and receiving mail in it.
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Question by:papa kota
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Phil Phillips earned 500 total points
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You might want to double check that you are including the intermediate certificate.

Check to make sure that you have "fullchain.pem" in your server config file instead of "cert.pem".
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by:papa kota
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Yes, but the Apache works fine. My site opens in HTTPS under the new cert OK. No problem with that at all. I've only found in /etc/postfix/main.cf couple of lines referring to the SMTPD TLS Files. But those two directives have links to the files I DID NOT touch. I think those two were created by Open SSL when I was configuring Postfix. Also Postfix does work, otherwise I wouldn't be getting e-mail in Squirrel Mail.
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