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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