Dear all; I make email server follow to http://www.howtoforge.com/virtual-users-and-domains-postfix-courier-mysql-fedora8 in my office and i set up email client to send-received email it work. But at home i try to setting same config at my office , i can received email with POP3 but i cann't send email it show error as attachment. Many thank.
In my experience you are seeing this error because something is blocking port 25. Could be a firewall, could be your ISP. Try and and have a friend on a different ISP telnet to 'your.server.name' port 25. If they can connect, and you can't then the problem is almost certainly your ISP you use at home. If they can't connect it's possibly a firewall blocking connections, or it could still be your ISP if you use the same one for home and work. If the problem is a firewall, you will need to disable it or have someone at the office allow you access. If the problem is your ISP, you will have to make postfix listen on a different port.
I use endian firewall (V2.2 RC2) to internet gateway ,mailserver in DMZ zone. I test firewall by telnet xx.xx.xx.xx 110 -> OK (from outside) telnet xx.xx.xx.xx 25 -> close connection I think firewall it block port 25 .Some one can help config endian to enable port 25.
Sorry, I can't help with endian. Suggest you follow Falko's advice and post back here once you have determined if they are blocking port 25 or not.
