Date: Thu, 14 Dec 2000 18:33:08 -0600 (CST)
From: CK <[EMAIL PROTECTED]>
We have experienced very bad email floods from the
Bare CRLF code in Qmail, where another site that
didn't understand the error and will keep sending
the same message forever. It seems to be automated
email programs and Microsoft SMTP servers, they will
just try the same message until they are put in the
badmailfrom file. I am not sure why this is not a
subject that has come up more, I would think others
would have had this problem. From what I can tell
Qmail would be better if it could somehow prevent
a server from doing this, the foreign hosts tend to
not listen to the way it currently complains to them.
We finally just commented out the Bare CRLF clauses
and we no longer have these floods occur. I am
wondering how many others have come accross this
problem and if this was how they dealt with it
or some other way? One example of a site that did
this was 'makeoverstudios.com' which I am not sure
if they still have that problem, but it was thier
automated email responder. We noticed this after
getting very large servers, and don't know if that
really made it show up or what?
I've seen this too, in my case from sites in China.
One easy fix is to change 451 to 554 in the string in straynewline in
qmail-smtpd.c. This changes a temporary error condition to a
permanent one, and normally causes the errant e-mail server to give up
immediately.
Ian
