Strange email problems since Service Pack installation

Hi. I installed the service pack today and started noticing some weird problems. I've forwarded email on to other people who have forwarded it on to others and they get an error email returned to them stating that the mail was undeliverable. I had them forward it on to me and I notice that the email was bounced back from a long session ID number @zohovo.com...Now, why is this email that they're forwarding on being bounced from you guys at zoho?

I've decided to test these problems myself and when receiving email from Yahoo, the name is severly messed up (but when clicked, it opens up and displays contact info properly...)

Let me know if I can provide any more info.