Re: New spammer exploit (seen on Bugtraq)

[Bruno Wolff III]

On Sat, Jul 17, 1999 at 09:35:59AM -0500,
  David Dyer-Bennet <[EMAIL PROTECTED]> wrote:
> I just saw mention on bugtraq of spammers trying to exploit
> 
>     RCPT TO: <"[EMAIL PROTECTED]"@relay.host.name>
> 
> What happened was that the mail was *accepted*, and then bounced
> (qmail seems to have ignored the quotes in the address).  This is

The quotes are used to hide special characters in the local part of
the email address. Qmail doesn't treat the local part of the address
specially. The relay problem occurs, because sendmail will interpret
local parts that have some special characters in them (e.g. @, ! and %)
is internet (or uucp) addresses and may forward the mail on to that address.