Emails are queued using SMTP

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This is a cpanel question posted by harbir on 23 October 2009

I am newbie to whole networking and SMTP, but I really want to know how the email works.
Am trying to send a mail using javamail and Default SMTP Virtual Server on my local machine.
In the program that sends the mail I have mentioned host as “localhost”, but the email are stuck in the queue folder.
I have read it that I need to use my ISP’s SMPT server, but I want to by-pass my ISP’s SMTP server, how can I do that
I have read it that I need to use a “smarthost”, but what is “smarthost” and how can I set it up.
By now you can figure it out that I am lost, but any suggestion that will put me in the right direction is much appreciated.

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