These seem to be the "output" of a cron job. It seems like the server 
is configured to auto-update itself. Any output cron generates gets sent 
by email. dead.letter is when the mta (mail server) cannot deliver that 
email

On 09/29/2010 01:00 PM, Tapas Mishra wrote:
> I was taking backup of my server when I noticed a file named dead.letter
> what is that it is in root folder and its contents I have not created.
>
> Here are the contents
>
> To: root
> Subject: CRON-APT completed on server [/etc/cron-apt/config]
>
> CRON-APT RUN [/etc/cron-apt/config]: Thu Sep 23 04:00:01 IST 2010
> CRON-APT SLEEP: 274, Thu Sep 23 04:04:35 IST 2010
> CRON-APT ACTION: 0-update
> CRON-APT LINE: /usr/bin/apt-get update -o quiet=2
> W: Failed to fetch
> http://debian.adenu.ia.uned.es/apt/dists/lucid/main/binary-amd64/Packages.gz
>   404  Not Found
>
> E: Some index files failed to download, they have been ignored, or old
> ones used instead.
> To: root
> Subject: CRON-APT completed on server [/etc/cron-apt/config]
>
> CRON-APT RUN [/etc/cron-apt/config]: Fri Sep 24 04:00:01 IST 2010
> CRON-APT SLEEP: 313, Fri Sep 24 04:05:14 IST 2010
> CRON-APT ACTION: 0-update
> CRON-APT LINE: /usr/bin/apt-get update -o quiet=2
> W: Failed to fetch
> http://debian.adenu.ia.uned.es/apt/dists/lucid/main/binary-amd64/Packages.gz
>   404  Not Found
>
> E: Some index files failed to download, they have been ignored, or old
> ones used instead.
> To: root
> Subject: CRON-APT completed on server [/etc/cron-apt/config]
>
> CRON-APT RUN [/etc/cron-apt/config]: Sat Sep 25 04:00:01 IST 2010
> CRON-APT SLEEP: 1383, Sat Sep 25 04:23:04 IST 2010
> CRON-APT ACTION: 0-update
> CRON-APT LINE: /usr/bin/apt-get update -o quiet=2
> W: Failed to fetch
> http://debian.adenu.ia.uned.es/apt/dists/lucid/main/binary-amd64/Packages.gz
>   404  Not Found
>
> E: Some index files failed to download, they have been ignored, or old
> ones used instead.
> To: root
> Subject: CRON-APT completed on server [/etc/cron-apt/config]
>
> CRON-APT RUN [/etc/cron-apt/config]: Sun Sep 26 04:00:01 IST 2010
> CRON-APT SLEEP: 2118, Sun Sep 26 04:35:19 IST 2010
> CRON-APT ACTION: 0-update
> CRON-APT LINE: /usr/bin/apt-get update -o quiet=2
> W: Failed to fetch
> http://debian.adenu.ia.uned.es/apt/dists/lucid/main/binary-amd64/Packages.gz
>   404  Not Found
>
> E: Some index files failed to download, they have been ignored, or old
> ones used instead.
> To: root
> Subject: CRON-APT completed on server [/etc/cron-apt/config]
>
> CRON-APT RUN [/etc/cron-apt/config]: Mon Sep 27 04:00:01 IST 2010
> CRON-APT SLEEP: 514, Mon Sep 27 04:08:35 IST 2010
> CRON-APT ACTION: 0-update
> CRON-APT LINE: /usr/bin/apt-get update -o quiet=2
> W: Failed to fetch
> http://debian.adenu.ia.uned.es/apt/dists/lucid/main/binary-amd64/Packages.gz
>   404  Not Found
>
> E: Some index files failed to download, they have been ignored, or old
> ones used instead.
> To: root
> Subject: CRON-APT completed on server [/etc/cron-apt/config]
>
> CRON-APT RUN [/etc/cron-apt/config]: Tue Sep 28 04:00:01 IST 2010
> CRON-APT SLEEP: 2393, Tue Sep 28 04:39:54 IST 2010
> CRON-APT ACTION: 0-update
> CRON-APT LINE: /usr/bin/apt-get update -o quiet=2
> W: Failed to fetch
> http://debian.adenu.ia.uned.es/apt/dists/lucid/main/binary-amd64/Packages.gz
>   404  Not Found
>
> E: Some index files failed to download, they have been ignored, or old
> ones used instead.
> To: root
> Subject: CRON-APT completed on server [/etc/cron-apt/config]
>
> CRON-APT RUN [/etc/cron-apt/config]: Wed Sep 29 04:00:01 IST 2010
> CRON-APT SLEEP: 3209, Wed Sep 29 04:53:30 IST 2010
> CRON-APT ACTION: 0-update
> CRON-APT LINE: /usr/bin/apt-get update -o quiet=2
> W: Failed to fetch
> http://debian.adenu.ia.uned.es/apt/dists/lucid/main/binary-amd64/Packages.gz
>   404  Not Found
>
> E: Some index files failed to download, they have been ignored, or old
> ones used instead.
>


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