Re: [Christmas Gift for free] 50% Spam reduction !

["Matthew R. Dempsky" <mrd@alkemio.org>]

On Sat, Jan 06, 2007 at 12:22:25AM -0500, Joshua Megerman wrote:
> Here's a 1-line patch to your program that spits out a 554 response code 
> before exiting if strict checking is enabled - this is required to maintain 
> RFC2821 compliance.  Since you are accepting the connection, you must give a 
> response, even if it's just "go away"...

I had considered this and have had others suggest the same.  The only
thing I don't like about it, however, is my understanding is that most
SMTP clients (vanilla qmail-remote is an exception that comes to mind)
treat a 554 error at connection as a permanent rejection, and there
aren't any 4xx codes that RFC 2821 allows at connection.

One other thought I had was to just set the RBLSMTPD environment
variable, and require the user to chain rblsmtpd after greetdelay.

Any thoughts?