A message with a colon in the value of the 'From:' header will never be shown by notmuch.el, as the regexp in notmuch-search-process-filter allows any character in the author names except ':'. It's simple to change the pattern, but I wonder what that will break.
Given that ';' is used as a delimiter, was the pattern supposed to exclude ';'? dme. -- David Edmondson, http://dme.org