The following message (146 kB) breaks the emacs interface: http://rtime.felk.cvut.cz/~sojka/notmuch/notmuch-wash-tidy-citations-stack-overflow.txt An attempt to view the message produced message "notmuch-wash-tidy-citations: Stack overflow in regexp matcherq" and it was not possible to work with the message. I tracked the problem down to the regexp search, which probably attempts to match a very big piece of text (several lines). I changed the regexp to only match a single line. The result is probably slower, but doesn't produce the error. --- emacs/notmuch-wash.el | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/emacs/notmuch-wash.el b/emacs/notmuch-wash.el index 26a3f88..051dd17 100644 --- a/emacs/notmuch-wash.el +++ b/emacs/notmuch-wash.el @@ -218,7 +218,7 @@ Perform four transformations on the message body: ;; Insert a blank line before a citation if there isn't one. (goto-char (point-min)) - (while (re-search-forward "\\(^[^>]+\\)\n>" nil t) + (while (re-search-forward "\\(^[^>][^\n]+\\)\n>" nil t) (replace-match "\\1\n\n>")) ;; Insert a blank line after a citation if there isn't one. -- 1.7.1.3.g75e44