I wrote: > > In general, retries are increasingly delayed because > > the retry cases include the case where the server > > is overloaded.
Oleg Kobchenko wrote: > I actually ran telnet against their mail server: > there is no increasing delay. The increasing delay I spoke of is the delay implemented in SMTP software -- between automated retries. If Yahoo is dropping connections, and SMTP software is reconfigured to try ten times more often, that could get interesting. That said, perhaps what we're seeing here is a spam avoidance heuristic -- spam software tends not to follow the standards, and [for example] tends to not retry. If that's the case, I can easily imagine a future variant on this system dealing with rapid retries in some different fashion from the current system. -- Raul
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