[Bug 360689] [NEW] Default Ubuntu configuration is backscatter source in Jaunty

[Imre Gergely]

Public bug reported:

Binary package hint: amavisd-new

The default Jaunty config of amavisd-new comes with the option
$final_banned_destiny set to D_BOUNCE. This setting causes mail with
banned attachments (like .com files) getting bounced back to the sender.
This in turn can cause backscatter, which is a sure way to getting the
server blacklisted.

TEST CASE:
install stock amavisd-new from Jaunty, configure postfix content_filter to use amavisd-new, start both, send a mail with ie eicar's testing signature (attaching eicar.com to the mail). The file gets banned, and bounce message goes back to the sender.
Edit /etc/amavisd-new/conf.d/21-ubuntu_defaults, and set $final_banned_destiny to D_DISCARD. Restart, send mail, no bounce.

** Affects: amavisd-new (Ubuntu)
     Importance: Undecided
         Status: New

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Default Ubuntu configuration is backscatter source in Jaunty
https://bugs.launchpad.net/bugs/360689
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