Currently I have my mail setup on my Windows server, and I'm trying to switch to linux. So I know my MX records are setup correctly since I'm currently able to receive mail just fine.
On my router I changed port from my windows box to the linux box (assuming this is what directs to the MTA)
Within webmail I can send myself an e-mail and it shows up. I can send my Gmail account an e-mail and it shows up. I cannot send mail from gmail to mydomain.com and have it come up in webmail. Soon as I switch the port back to the windows server my Outlook downloads the message.
What am I missing here?