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How many threads should be used for achieving the maximum delivery speed?

April 26, 2017achieving DELIVERY maximum speed threads Used

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How many threads should be used for achieving the maximum delivery speed?

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For sending messages via the built-in SMTP server: 20-30 if the message size is not great (5-20 kb) or 10-15 if the message size is not greater than 30-40 kb. For sending messages via the regular SMTP servers: not more than 7-15 threads per server – if you set a greater value, the server can be overloaded. If you send messages via 2-3 *different* SMTP servers, then set 5-7 threads per each server.