Title: send 15000 mails using qmail in one time

hello

i tired to send out 15000 mails using qmail at the same time.
after a long long time (about 12 hours), some mails are still in the queue.

why it takes so long to deliver the mails?
what can i do to speed up the delivery time?
is the qmail re-sending all the bounced back mail so that the queue is full and cant deliver mail anymore?
can the number of re-tries be changed?

many thanks

regards
KY

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