[MlMt] Missing intermediate certificate(s) for S/MIME message.

[Eric Sharakan]

Hi, I just received a message from a colleague which generated this 
warning:

     Missing intermediate certificate(s) for S/MIME message.
     The message signature is valid, but intermediate certificates are 
needed to determine trust.

And to the right are two buttons: "Show Details" and "Allow Network 
Fetch".  I understand the first button, but what exactly does "Allow 
Network Fetch" do?  I clicked it but it didn't seem to have any effect.

In case it's relevant, the sender is from the Czech Republic, and 
presumably the CAs there are not being trusted by default in macOS, 
leading to the warning.

Thanks.

-Eric
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