Subject: bug#2161: This might explain it

From: jpff <[email-masked]>
Date: Mon, 02 Feb 2009 13:15:16 +0000

I have been single stepping the convertion for the last 2 hrs and it
failed with

Warning (undo): Buffer `RMAIL' undo info was 99232433 bytes long.
The undo info was discarded because it exceeded `undo-outer-limit'.

This is normal if you executed a command that made a huge change
to the buffer.  In that case, to prevent similar problems in the
future, set `undo-outer-limit' to a value that is large enough to
cover the maximum size of normal changes you expect a single
command to make, but not so large that it might exceed the
maximum memory allotted to Emacs.

If you did not execute any such command, the situation is
probably due to a bug and you should report it.