javax.mail.MessagingException: 554 mail server permanently rej

Dear sir ,
I am getting the follwing exception while sending an mail.when i send a mail from gmail Id to my organisation Id then it works fine ,if i send a mail from organisation Id another Id(gmail or organisation)then i am getting an exception so how to resolve this..
exception:in mail:javax.mail.MessagingException: 554 mail server permanently rej
ected message (#5.3.0)

thanks...

Hello,

It sounds email from your organization and/or IP is blacklisted, on RBL's, is too spammy, or has some other security problems.

Send an email email that fails instead of examples@EmailQuestions.com so we can help you figure out if it's a problem with your IP address, your email content, or both.

and welcome to Email Questions!

Is your application web based and internet accessible?

Make sure there is not a form being abused and used for spamming by a 3rd party.

That's a quick way to end up on your ISP's block list too.

-Raymond