Yeah usually people don't care about their IP being sent with their emails unless either they are sending a message where they don't want to be tracked, or they want to try to have the blame be put on someone else for the email sent.

Truthfully if someone had the time and resources, they could sit and track you down, even if you were able to spoof your IP. It doesn't take a rocket scientist, just the time and logs of all the servers that were "hopped" to and from.

My suggestion, and I think I speak for a lot of people here, is try not to find ways around the system. Just be a good little user and play by the rules as they have been set forth!

Thank you,
AciD