Does anyone know how to totally remove Boxtrapper (i.e. from the Mail menu, the Webmail screens, from the exim configuration and from any existing users configurations) reliably?
Why do I want this? Well, BoxTrapper has managed to get one of our servers listed on SORBS blacklist and the only way to get it removed from the list is to either remove BoxTrapper or pay $50 and *hope* it doesn't happen again.
Why do I want this? Well, BoxTrapper has managed to get one of our servers listed on SORBS blacklist and the only way to get it removed from the list is to either remove BoxTrapper or pay $50 and *hope* it doesn't happen again.
Your mail system appears to use challenge/response to try to fight spam.
Unfortunately it sends the challenges to forged sender addresses found
in spam, and is therefore trying to fix your spam problem by making it
the problem of any unrelated third parties instead.
Many challenge/response systems are misconfigured in this manner. It is
possible to fix this by sending the challenge in the SMTP response code
to the DATA section instead of accepting the message and generating a
bounce.
In general, you can't accept a message these days and generate a bounce
post-reception for just about any reason because the bounce will
invariably go to an address that belongs to somebody who had nothing to
do with the sending of the original message. Spam filters and
challenge/response mechanisms that operate on the premise that the
sender address freely chosen in a message is correct must cease to exist.
With backscatter (responses to forged addresses found in spam) currently
making up 85% of my spam volume (15% actual spam and 85% bounces of all
kinds resulting in spam having been forged in my name, thousands of
unwanted bounce messages every month for already a year now), it is
obvious that these schemes must end.
We will delist the server without the SORBS 'fine' if you confirm that
the challenge/response scheme has been either abandoned or fixed to send
the challenge in the SMTP response code instead, and if abandoned, that
it has not been replaced with any other spam filtering scheme that
causes similar backscatter (such as the Barracuda Spam Firewall, a
spammer's sorry excuse for a spam filter that cannot be configured to do
the right thing under any circumstances).