Hi Mark. I am not sure I like this solution. My concerns are: * New option looks too complex, too specific. * There are more aspects of notmuch reply behavior which users would like to change (e.g. which part to quote). If we add an option for each, we complicate both nomtuch show UI and code. The problem is that notmuch show output format is too limiting. Instead of providing myriad of options for tweaking notmuch show text format behavior, we should add JSON format for notmuch reply similar to nomtuch show. That would allow notmuch reply to produce structured output with required additional information, which should be enough for users to construct whatever reply they want. In this particular case, notmuch reply JSON format could have "from-source" attribute that would indicate how it was guessed. Now the best part. Not so long ago, Adam (in Cc) provided a patch for improving nomtuch reply for HTML-only emails. At first he added an option for notmuch reply, like you did for from-guessing. I suggested him to implement it based on the JSON format instead and he did. AFAIK the latest version of his patches is [1]. I did not look at the code though. It seems that it is waiting for more review. So, instead of adding more nomtuch show options, I think a better solution is to work with Adam to get the notmuch reply JSON format to master and then fix the from-guessing issue by adding an attribute to notmuch reply JSON format. Regards, Dmitry [1] id:"1326995217-27423-1-git-send-email-awg+notmuch@xvx.ca"