yum 3.2.8 - practical d and e options for cron?

Rainer Traut <[email protected]>
Newsgroups gmane.linux.rpm.yum
Message-ID <[email protected]> 
Dear all,

-running said yum version- I want to get mails from yum only if it 
actually updates/installs something.

What are the corresponding -d and -e options for this?
Am using atm -d 0 -e 0.

Thx
Rainer
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