Multiple Yubikeys/Smartcards and Thunderbird email client

Ingo Klöcker kloecker at
Thu Jul 15 12:24:02 CEST 2021

On Donnerstag, 15. Juli 2021 03:22:47 CEST Brandon Anderson via Gnupg-users 
> I have several Yubikeys and smartcards in my setup, each with its own
> signing subkeys, and I use these, among other things, to sign email
> messages. Whenever I want to send an email on thunderbird, it demands a
> specific smartcard by serial number for email signing and will refuse to
> use the smartcard/Yubikey plugged into the system.

Which version of gpg are you using? If you are not using 2.3, then please 
retry with gpg 2.3.1. Support for multiple smartcards was significantly 
improved in 2.3.

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