gnus-alias allows you to set your identity based on the headers in the
message you are replying. This is an essential feature in a mail client
for me, I want to automatically reply as the person an email was sent to
for certain addresses. This does not work in notmuch. gnus sets the
variable message-reply-buffer when it sets up a message, which
gnus-alias uses to go grab headers. It creates a buffer named
*gnus article copy* which contains all the headers and the message body. It 
seems notmuch does not set this
variable when it sets up a reply.

Here is an example of a rule needed to do this.

(setq gnus-alias-identity-rules
           ("to" "work at" previous)

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