Is it possible to search for emails containing a specific custom header value using notmuch?
I know it's possible to search for standard headers like
notmuch search from:alice subject:hello to:[email protected]
but is there a way to search for something like this?
notmuch search Accept-Language:en-US X-Spam-Flag:NO
It's possible since notmuch 0.29 - see man pages for notmuch-config(1)
index.header.<prefix> [STORED IN DATABASE]
Define the query prefix <prefix>, based on a mail header. For
example index.header.List=List-Id will add a probabilistic pre‐
fix List: that searches the List-Id field. User defined pre‐
fixes must not start with 'a'...'z'; in particular adding a pre‐
fix with same name as a predefined prefix is not supported. See
notmuch-search-terms(7) for a list of existing prefixes, and an
explanation of probabilistic prefixes.
As mentioned in the manual it's stored in the database - similar to custom queries. You have to set it for every header you want to search.
So in the case mentioned in Your question:
notmuch config set index.header.AcceptLanguage Accept-Language
notmuch config set index.header.XSpamFlag X-Spam-Flag
It's possible you would need to reindex your database
notmuch reindex '*'
and finally runing the search
notmuch search AcceptLanguage:en-US AND XSpamFlag:NO
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