I believe it happens when there are exim child processes spawned from
Apache, and you then kill Apache. This happens e.g. if you have perl or
php scripts that call "/usr/bin/sendmail" or similar to send mail, and
those child processes are still running when you kill the webserver.
this may be the cause, because around that time tousands of mails were
send
out by a php script.
stone
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