> I perform some tests but cannot send fasten than 200 megabit/sec.

Which is pretty good performance, presumably you need more because this
is running on a hosted server with gigabyte connectivity? 

> I see RFC 2821 and found what max line length can be 1000 
> characters! 

Not strictly relevant, I think that is for text, not MIME. 

> My question is: why message data send line-by-line instead of larger
> portions ? 

But that does not mean SmtpCli can not send multiple MIME lines at a time
using Send or something, reducing the number of function calls.  

It was probably written to send a line at time at a time when were all
using slow modems to communicate with each other.   

It is probably a relatively simple change to SmtpCli, but finding the
time to look at it is difficult for all of us.  Is it something you can
change yourself? 


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