JavaMail Question: How to find IP address of email sender?

Hi,
I currently have a program that fetches email from a pop3 server and processes the email text.
I want to filter out emails to process based on IP address of the sender.
Can you please tell me whether it is possible to obtain the IP address of the sender using JavaMail?
If yes, how? If not, what else can I use?
Thanks,
nitrousFiz

Fayezin wrote:
I have checked the RECEIVED headers closely. It seems that the last IP is of my mail server, not my machine from which the email was sent. Excellent. You have done the experiment. Now you know what IP addresses you can get.
Is there a way to get the sender's machine IP or do I have to settle for the email server IP?So you did the experiment. You have the results. They already told you the answer to that.
Here's what you need: an understanding of e-mail's architecture. As you already know, it's the servers that send the messages around the Internet. The servers have their own ways of deciding whether to trust an e-mail client. They may use authentication or lists of approved relayers or something else, or they may blindly trust everyone, but it's up to the initial server to decide whether to trust a client.
It is NOT up to the receiving server to decide whether to trust a client of another server. That's not its business. The receiving server only has the option of deciding whether to trust other servers. In particular your desire to process e-mails from specific locations only is in conflict with the basic architecture of e-mail.
So, I don't know where that requirement came from but if it's really aimed at the client who is sending the e-mail then you can't do that. It would be best to go back and find out why you have that requirement and how that can be implemented within the existing e-mail architecture.

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