Hopefully this is the last issue I come across, I have everything up and running an email server running Ubuntu 5.1 and postfix courier imap and can send and receive from the domain fine, I can receive from any other domain, I just cannot send to them. I have read a lot about port 25 being blocked by my provider, is that possible? When I try to send my mail client give this message: Server replied: 554 <[email protected] and I am tailing the mail.log and see this: NOQUEUE: reject: RCPT:from unknown[my web server's ip address] Is this enough information to determine some possible causes? thanks!! Ok I also see this in the log: ERROR:5.7.1:550 Mail Refused - res.rr.com - See http://security.rr.com/rrDynamic.htm (port 25) and when reading that site it basically says they block it, soooo...I'm out of luck??