FYI: A stock qmail installation limits the value of "concurrencyremote" 
to 120.  There are several patches available that raise this limit, however.

-- Sam Clippinger

Eric Shubert wrote:
> Greg Cirelle Enterprises wrote:
>   
>>     
>>>> You're close, but not quite there.
>>>>
>>>> Spamdyke (v4) can impose two different timeouts depending on the
>>>> configuration, one for the total session and one for inactivity. However,
>>>> spamdyke is only active on *incoming* smtp sessions, so spamdyke doesn't
>>>> come into play in this scenario.
>>>>
>>>> What's probably happening is that during the day your server or bandwidth
>>>> are overloaded to the point where a receiving server times out, qmail sees
>>>> that there was no acknowledgment of successful transmission, and
>>>> reschedules
>>>> delivery, resulting in the duplicate. I'd try throttling back the number
>>>> of
>>>> concurrent remote tasks. You should have a
>>>> /var/qmail/control/concurrencyremote file that specifies this value.
>>>> See "man qmail-send" for details.
>>>>
>>>> --
>>>> -Eric 'shubes'
>>>>     
>>>>         
>> Thank you Eric, the current value is 600 will try reducing this some, I
>> think
>> the original value was 400
>>     
>
> Wow. A more appropriate value here should cure your problem. FWIW, the
> default for qmail is 20, and qmail-toaster's default is 60. You want this
> value to be somewhat less than what it would take to saturate your available
> bandwidth. How much less depends on how much bandwidth you need to reserve
> for other concurrent activity (incoming mail, dns, etc).
>
>   
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