Sam Varshavchik wrote:
Alejandro Facultad writes:
Hi people,
Now I'm installing the Courier 0.48 in my Fedora OS, and because I need
Authenticated SMTP, I just want to know if I have to open the ESMTP tcp port
in my firewall or just the SMTP tcp/25 port in order to authenticate the
Authenticated SMTP uses the same port, port 25.
Perhaps you're referring to the message submission port, port 587. It's up to you to decide if you want to open it up.
So many options. ;-) In my installations, I *allow* authentication on 25 but never allow relaying on that port. Relaying requires submit port and submit port only allows authenticated connections.
With so many options, one wonders if there is a good resource for best practices when it comes to email servers and, perhaps more specifically, Courier configuration (for various target functionality).
Bill
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