On Tue, 22 Apr 2008, CLEMENT Francis wrote:

> Seems there was some post about this.
> 
> The BIG figure is when the final domain have multiple mx servers.
> Suppose the final domain have two mx and one is misconfigured and return
> a 5xx.
> So if xmail tries first the 'bad' server, what to do next ?
> 
> On a atomic try/retry cycle, you have two choices :
> 1 - don't try others mx and send back an NDR to the sender
> 2 - Try the others reminding MX for this try/retry cycle, and send back
> an NDR ONLY AND ONLY IF all mx return a 5xx, else schedule a normal
> retry cycle (that will retry on each mx).
> 
> I think option 2 is better :)
> 
> Could Davide tell us how xmail handles the 5xx with multiple mx ?

As far as smtprelay goes, a failure (of whatever type), means try the next 
server in the list.


- Davide


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