Also to explain things further, sending an email is done by a simple unix command, if you want to send a message to thousands of people it would be a very simple thing.
to clarify things more let me explain how mass mailing works by simple steps,
1. create a message body: which in our case is around 3 kilobytes.
2. add recipients: lets assume an average address length of 25 characters; 25x30.000 recipients= 750 kilobytes. names of recipients lets assume 40 characters
per name; 40x30.000= 1200 kilobytes.
3. add 2 characters (commas) to separate each address and name: 2x30.000=60 kilobytes
4. add 255 bytes of data to each file, in our case we have two files one is the message body, the other is the comma separated text file which has the addresses and names; 255x2=510
4. the total amount of data to be transferred from the NRMP operators computer to the email server is 510+60.000+1.200.000+750.000+3.000=2.100.000 bytes (around) which is roughly 2 MB of data which my home computer would transfer in TWO SECONDS, and a corporate intranet would transfer in 0.25 SECONDS.
Now do you still think you need separate computers for mass mailing.
things are different when the data reaches the mail server,
every mail address and name are parsed and matched to the message body and than transmitted which sum up to 3070 bytesx30.000=92.100.000 bytes of data which is roughly 90 MB's. considering that an average web hosting server (which costs 10 dollars a month) can transfer up to 50 MB of data per second (the maximum I have witnessed) the mailing process would require TWO SECONDS.
so the total time required to transmit data would be 2+2 = FOUR SECONDS, lets add 10 seconds to be fair to the server to parse the data, it will be FOURTEEN SECONDS to send a message to 30.000 recipients on a decent network.
WHY ON THE FACE OF EARTH WOULD YOU REQUIRE MULTIPLE MAIL SERVERS FOR SUCH A SIMPLE TASK ?
Any computer major student would write the script to run very efficiently in less than a day...(for data transfer and server side mailing, not applicant selection database)
We will see in less than a week...