Re: [cobalt-users] Sendmail features

[Parker Morse <morse@xxxxxxxxxxx>]

On Friday, April 11, 2003, at 06:56  PM, Martin wrote:
> The reason I was asking about the Feature blacklist_recipients is that, 
> if I
> correctly understand from what I read, it is possible to bounce the email
> including a few custom lines (for example, 'please resend the email to
> newabc@xxxxxxxxxx') without the spammers mailserver bouncing the bounced
> email back to me, etc etc etc, but discarding the bounced email 
> immediately.
> I think I remember reading it had something to do with the error status
> inside the bounced email (500?) which tells a mailserver not to continue
> trying to deliver the message?

Indeed, I use this quite a bit when someone leaves the company. I add a 
rejection line to /etc/mail/access which refers to a web page. On that 
page I give current (to my knowledge) contact information for that address,
 both their new address (I munge it) and the address of the person now 
handling their function at our company. Legitimate senders can follow the 
link and get current information; spammers can ignore one more bounce 
message. Quite useful.

pjm