Hey everyone. I want to install and configure Postfix to relay off of a mail server that already exists in my datacenter. The relay does not require authentication and all the guides that I have fo... [by ykket]
I'm trying to configure my postfix (2.9.6) mail server to initially try deliver messages directly to the recipient MX, then fall back to relaying through my ISP's mail server if it recieves a 5xx status code. My mail server is on the end of a home broadband connection so it falls foul of spamhaus filtering.
I installed postfix on a bare bones Ubuntu Server 12.04 by typing the following in the terminal.
sudo apt-get install postfix
When asked to choose a mail server configuration type, I chose Satellite system. For the System mail name, I entered ww1.example.com and for the SMTP relay host, I selected mail.example.com. Note that I replaced example.com with my own domain.
I have a postfix mail server that should relay all outgoing mail to an Exchange 2010 server (the Exchange box is my smarthost). I have administrator access to the Exchange 2010 system, but I'm not very familiar with it.
I have been at this for a couple of hours, and apparently I am missing something in newer postfix versions. I have the server set up, and it works locally but when I try to send from a remote network through the submission port, I always get "Relay access denied".