i am using smtp to connect to my java apps to send mails. we are picking and throwing html code using string to send mails at receiving end (PMTA). As the size of html code increases(10kb = 30,000 in 1 min; 20kb+ = 10,000 in 1 min ).

Also note that pmta and java apps is hosted onto the same server.

We are looking for the solution to speed up constantly the sending process upto 100kb @ approx. 35,000 per min. for sending mails.

server configuration :

ram = 16gb
os = centos 5.10
bit = 64
processor = 16 core (intel xeon (R) with 2.10 ghz).