I've designed a mail sender using java and front-end instances that can 
send ~70-80 mails /second  (i sometimes over-hit that 4900 mails/minute 
that is enforce by Google)(Using 5 front-end instances 
and thread-safe activated)
If you are not send mails single thread i suggest you read about another 
but I've encountered (
http://code.google.com/p/googleappengine/issues/detail?id=5769 - appears when 
you try to send 2 mails in the exact same millisecond or something like 
that)
I've seen that 20 seconds delay in some of my tasks execution, but only in 
queues that have a low number of tasks in them (1-5).


On Wednesday, August 31, 2011 1:10:38 PM UTC+3, pdknsk wrote:
>
> I haven't been able to figure out what the reason is. It seems to have 
> improved slightly to about 3/s but it still had 20 seconds delays 
> occasionally for no apparent reason. I've since moved mail sending to 
> a named version (rather than backend), and it works great. It can 
> easily send 6/s, with one instance.

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