I was having some issues sending/recieving email to outside mail address's (gmail, hotmail) when I started poking around and looking at the headers coming from our server I noticed that our internal mail server nat address was in the header when I looked at the mail on my hotmail account. Thinking that this was incorrect I opened a case with support and the response I got was that this was completely normal. After looking at mail from 10 other mail servers I found none of them had the internal nat address in the header. My question is how many other zimbra customers/users are seeing their servers sending out internal nat address's? And if so what needs to be changed on my config to resolve the problem. Any feedback would be helpfull.