notmuch does not find some mails which actually are part of a thread

[Gregor Zattler]

Hi Brian,
* Brian Sniffen <bts at evenmere.org> [2017-10-28; 15:50]:
> Try the first command prefixed with “echo”. You will see that your shell is interpreting the dollar signs. 

blush, you are right, enclosed in "'" it works.

Thanks, Gregor