Re: SPF and SMTP 551/251 result codes.

On Fri, Mar 26, 2004 at 07:02:31PM +0000, David Woodhouse wrote:
| >  Instead the former forwarding machine is to return a 551 and the new
| > address. But, how does the forwarding machine discover the new
| > address?
| 
| It's in the 551 response. That's what a 551 response is _for_.

Actually, that's what the 251 response is for, but to my knowledge
nobody implements it.  See RFC2821 section 3.4.