[Bug 1661709] [NEW] Could not verify certificate

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Public bug reported:

Hello,

I use Thunderbird 52.0b1 (64-bit), for Ubuntu 14.04
from ppa:mozillateam/thunderbird-next

I have a Certificate from an Intel CA :

Issuer:
CN = AddTrust External CA Root
OU = AddTrust External TTP Network
O = AddTrust AB
C = SE

Issued To:
CN = Intel External Basic Issuing CA 4A
 O = Intel Corporation

Now if I use the certificate manager and
I find this certificate under "Authorities"
under the "AddTrust AB" entry as
"Intel External Basic Issuing CA 4A"

Now if I select this certificate and click on "View...",
Thunderbird reports:
"Could not verify this certificate for unknown reasons."

This in itself would not be a problem.
The real problem is, that I am not able to send encrypted S/MIME
E-Mail to any people which have an E-Mail certificate signed
by this "Intel External Basic CA 4A" Authority.

Unfortunately I have no clue how debug this issue, since there is
no log or more detailed error what exactly the problem is.

>From inspecting the certificate everything seems to be ok.

Can someone please have a look what exactly the issue might be ?
Any hints how to debug this problem are also welcome.

I attach the certificate in question "intel_external_ca_4a.crt"

You can import this certificate via the certificate manager.
- Select Authorities.
- Click "Import..."
- Select the file "intel_external_ca_4a.crt"


so long
  Ingo

Note: This issue also is present for Thunderbird 45.7
If I use Thunderbird 24.6 the certificate also cannot be verified,
but I am still able to send E-Mail to people who use this certificate...

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "intel_external_ca_4a.crt"
   https://bugs.launchpad.net/bugs/1661709/+attachment/4812683/+files/intel_external_ca_4a.crt

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https://bugs.launchpad.net/bugs/1661709

Title:
  Could not verify certificate

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