Dear Community, I've got my own domain and when registering or shopping at some website, I always use email addresses of the form "websitename@mydomain.org", so for example I use "amazon@mydomain.org" when shopping at amazon. The reason for this is categorizing incoming mail on the one hand, and immediately being able to spot the source of spam on the other hand. I would like to implement the following behaviour: When replying to a mail that has "something@mydomain.org" in the "To"-header, I would like to have the "From"-header of the reply to be automatically set to this address. Is there some kind of reply-hook in notmuch where one could put an appropriate function? Thank you very much for your help, Simon