Several threads connecting to a Postfix server?

I'm writing a program which is sen开发者_运维技巧ding files through SMTP, thanks to my (local) Postfix server, on port 25.

Is it possible to use several threads (thus several sockets) to inject emails faster ?

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Depends entirely on where the bottleneck is. If it's on the SMTP server or the network, the answer is no. If it's in your python code, probably yes.