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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: newline cache
Date: Sun, 27 Apr 2014 05:42:00 +0300
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> Date: Sat, 26 Apr 2014 22:58:51 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> Based on the few incidents I had until now, it looks like the cache
> gets corrupted after deleting several mails, then saving the mailbox
> buffer.  Not sure yet what exactly causes this.

One more important fact: not each time I delete messages and then save
the mailbox, I get the cache corrupted.  So some other factor is at
work here.