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Re: Internet Mail Architecture draft

2004-05-29 14:39:54

On 5/29/2004 4:25 PM, Dave Crocker wrote:

EAH> 4xx means something completely different at:

Well, the 4yz response code model is actually the only reason I think
queuing _might_ be in the architecture.

5xx has the same sort of input.

   ^           ^  ^
   |           |  |
   |           |  try next host in MX set
   |           |
   |           try next-best MX
   give up entirely

4xx is worse because of things like disk space causing requeuing

Eric A. Hall                              
Internet Core Protocols

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