Why doesn't JavaMail work, but PHP mailer does?

I am trying to use JavaMail to send emails from my webserver. I've plugged in the host and the addresses are valid, but I am getting 550 errors. I've searched and found that I should change a setting on my mail server to allow relays from my webserver. However, we have a PHP mailer working on our webserver now, so presumably that relay is already in there. Why does the PHP work but the JavaMail doesn't?

Can you turn on session debugging and post the protocol trace that shows the failure?
The error codes alone are not enough, you usually need to look at the message included
with the error code.
Also, have you found the JavaMail FAQ?

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