I received the attached piece of spam telling me about an exciting
investment opportunity.  Notmuch pulled it in to the database, noting
the message id.  But then it seems to stop paying attention to the
message id.

notmuch can find the mail when I search by the from field:

$ notmuch search "from:caroline horn"
thread:000000000000bcb7  Today 09:29 [1/1] Caroline Horn; This Company is on the rise (hv inbox unread)

But not by the message id:
$ notmuch search id:000801cdb5da$17673470$26448589@microsof000000t4ko3r
$

Notmuch has correctly pulled the id into the database:
$ notmuch show "from:caroline horn" | grep "id:" | sed "s/.*\(id:[^ ]*\).*/\1/"
id:000801cdb5da$17673470$26448589@microsof000000t4ko3r

If notmuch knows the id but won't match it in a search, that looks like
a bug to me.

On a related matter, I have a script that pulls the message id header
From a mail file and then uses notmuch tag id:foo to tag that file.  But
if notmuch sometimes fails to find the id, maybe there is there a better
way to do it?

Thanks,
James